Consulta: subjectFacets:"Heritability"
Registros recuperados: 177
Data/hora: 03/06/2024 16:37:54

Estimación de parámetros genéticos para vida productiva, vida productiva funcional, características de producción de leche, características reproductivas y características de conformación en caprinos productores de leche.
Provedor de dados: 32
Autores: Castañeda Bustos, Vielka Jeanethe.
Se obtuvieron los estimados de heredabilidad y las correlaciones genéticas y fenotípicas de producción de leche, reproducción y conformación con la vida productiva, real y funcional, a los 72 meses de edad en cabras lecheras utilizando el modelo animal. La vida productiva se definió como el total de días registrados en producción hasta los 72 meses de edad (VP72). La vida productiva funcional (VPF72), se obtuvo corrigiendo la VP72 para las producciones de leche (PL), grasa (PG) y proteína (PP), y calificación final de tipo (CF). Se usaron índices de selección incluyendo o excluyendo VP72 para estimar las respuestas a la selección considerando PL, PG, PP y VP72 como criterios de selección. Los principales criterios que determinaron el desecho de una cabra...
Palavras-chave: Vida productiva; Características de conformación; Heredabilidad; Correlación genética; Índice de selección; Productive life; Type traits; Heritability; Genetic correlation; Selection index; Ganadería; Doctorado.
Ano: 2013
URL: http://hdl.handle.net/10521/2128

Resistencia de clones de papa al tizón tardío (Phytophthora infestans) y su caracterización morfológica en el Valle de Toluca.
Provedor de dados: 32
Autores: Rivadeneira Ruales, Jorge Esteban.
El rendimiento, la resistencia a enfermedades y la calidad del tubérculo son las características más importantes en el mejoramiento genético de la papa (Solanum tuberosum); por ello, el objetivo de la presente investigación fue estudiar los componentes de varianza y heredabilidad en sentido estrecho (h2) de la respuesta a Phytophthora infestans, así como la caracterización morfológica de clones resistentes, así como seleccionar los clones con resistencia y buenas características agronómicas. Se evaluaron 198 clones en primera generación clonal de 20 cruzas, y 13 de los 20 progenitores en el campo experimental del Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), en el valle de Toluca, Estado de México. Más del 30% de clones...
Palavras-chave: Solanum tuberosum; Phytophthora infestans; Resistencia; Tizón tardío; Heredabilidad; Diversidad genética; Clones; Cruzas; Progenitor; Resistance; Late blight; Heritability; Genetic diversity; Clones; Crosses; Parent; Maestría; Genética.
Ano: 2011
URL: http://hdl.handle.net/10521/505

Parámetros genéticos e interacción genotipo x ambiente en el crecimiento de progenies reintroducidas y nativas de Pinus patula.
Provedor de dados: 32
Autores: Gómez Martínez, Procoro.
Pinus patula Schiede ex Schltdl. et. Cham., es una especie nativa de México ampliamente utilizada en plantaciones comerciales en diferentes regiones del mundo; la especie ha sido mejorada en el extranjero, y es necesario evaluar el material al ser reintroducido a su país de origen. Se comparó el crecimiento de 36 familias de medios hermanos seleccionadas en Colombia y Sudáfrica, reintroducidas en México (grupo R) y 36 familias de medios hermanos escogidas fenotípicamente en rodales naturales (grupo N), en dos sitios con ambientes contrastantes: Aquixtla, Puebla, a 2,930 m (S1) y Acaxochitlán, Hidalgo, a 2,260 m (S2). Se midió el diámetro normal, la altura total y el volumen del fuste a los siete y ocho años de edad, y la conformación del árbol y el número...
Palavras-chave: Análisis de estabilidad; Correlación genética tipo B; Crecimiento; Ganancia genética; Heredabilidad; IGA; Parámetros genéticos; Pinus patula; Progenies; Reintroducción; Adaptation; Ecovalence; Genetic stability; Genetic gain; Genetic parameters; Growth rate; GEI; Heritability; Progeny test; Type-B genetic correlation; Reintroduction; Forestal; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/1892

Efectos de aptitud combinatoria y de interacción genotipo x ambiente en maíz para provitamina A y rendimiento.
Provedor de dados: 32
Autores: Mingramm Yarza, Germán.
Con la finalidad de evaluar la aptitud combinatoria y los efectos entre genotipo y medio ambiente en maíz, en relación con la provitamina A y rendimiento, la presente investigación se realizó utilizando las cruzas de 38 líneas (22 pertenecientes al grupo heterótico A y 16 al grupo heterótico B) con tres probadores cada una. Los híbridos formados se evaluaron en cuatro ensayos (tres del grupo heterótico A y uno del grupo heterótico B) bajo un diseño de bloques incompletos al azar. Cada ensayo se sembró en cuatro ambientes dentro de dos localidades (Tlaltizapán, Morelos– condiciones normales y labranza de conservación; y Agua Fría, Puebla– condiciones normales y de estrés hídrico). Los híbridos se evaluaron para rendimiento, días a floración y altura de...
Palavras-chave: Zea mays; Carotenos; Heredabilidad; Aditividad; Carotenes; Heritability; Additivity; Producción de Semillas; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/777

Parámetros genéticos en características de crecimiento y densidad de la madera en progenies de Eucalyptus grandis
Provedor de dados: 32
Autores: Harrand, Leonel.
Con el fin de determinar la estructura genética de las características de crecimiento y densidad de la madera (evaluada de manera directa y a través de la penetración del Pilodyn) y estimar la respuesta esperada a la selección masal en una población de Eucalyptus grandis formada por familias del NE de Queensland (Australia), se evaluó un ensayo de progenies a los 4.5 y 8.5 años de edad, establecido en tres sitios del NE argentino. Aunque se encontró una amplia variabilidad genética en todas las características evaluadas, las características de crecimiento [diámetro (DAP), altura (HT) y volumen (VOL)] mostraron diferente estructura y grado de control genético con respecto a las otras características [rectitud de fuste (FORM), proporción de corteza (COR) y...
Tipo: Tesis
Palavras-chave: Heredabilidad; Correlación genética; Correlación edad-edad; Estabilidad genética; Respuesta a la selección; Selección indirecta; Selección temprana; Densidad de la madera; Pilodyn; Maestría; Forestal; Heritability; Genetic correlation; Age-age correlation; Genetic stability; Response to selection; Indirect selection; Early selection; Wood density.
Ano: 2007
URL: http://hdl.handle.net/10521/1648

Resistencia de clones de papa al tizón tardío (Phytophthora infestans) y su caracterización morfológica en el Valle de Toluca.
Provedor de dados: 32
Autores: Rivadeneira Ruales, Jorge Esteban.
El rendimiento, la resistencia a enfermedades y la calidad del tubérculo son las características más importantes en el mejoramiento genético de la papa (Solanum tuberosum); por ello, el objetivo de la presente investigación fue estudiar los componentes de varianza y heredabilidad en sentido estrecho (h2) de la respuesta a Phytophthora infestans, así como la caracterización morfológica de clones resistentes, así como seleccionar los clones con resistencia y buenas características agronómicas. Se evaluaron 198 clones en primera generación clonal de 20 cruzas, y 13 de los 20 progenitores en el campo experimental del Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP), en el valle de Toluca, Estado de México. Más del 30% de clones...
Palavras-chave: Solanum tuberosum; Phytophthora infestans; Resistencia; Tizón tardío; Heredabilidad; Diversidad genética; Clones; Cruzas; Progenitor; Resistance; Late blight; Heritability; Genetic diversity; Clones; Crosses; Parent; Maestría; Genética.
Ano: 2011
URL: http://hdl.handle.net/10521/505

Genetic parameters for five traits in Africanized honeybees using Bayesian inference
Provedor de dados: 74
Autores: Padilha,Alessandro Haiduck; Sattler,Aroni; Cobuci,Jaime Araújo; McManus,Concepta Margaret.
Heritability and genetic correlations for honey (HP) and propolis production (PP), hygienic behavior (HB), syrupcollection rate (SCR) and percentage of mites on adult bees (PMAB) of a population of Africanized honeybees were estimated. Data from 110 queen bees over three generations were evaluated. Single and multi-trait models were analyzed by Bayesian Inference using MTGSAM. The localization of the hive was significant for SCR and HB and highly significant for PP. Season-year was highly significant only for SCR. The number of frames with bees was significant for HP and PP, including SCR. The heritability estimates were 0.16 for HP, 0.23 for SCR, 0.52 for HB, 0.66 for PP, and 0.13 for PMAB. The genetic correlations were positive among productive traits...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heritability; Genetic correlations; Environmental effects; Apis mellifera.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000200011

Genetic parameters and selection strategies for soybean genotypes resistant to the stink bug-complex
Provedor de dados: 74
Autores: Godoi,Cláudio Roberto Cardoso de; Pinheiro,José Baldin.
Soybean genotypes resistant to stink bugs are derived from complex breeding processes obtained through indirect selection. The aim of the present work was to estimate genetic parameters for guiding selection strategies towards resistant genotypes, based on those traits associated with responses to pod-attacking stink bugs, such as the grain filling period (GFP), leaf retention (LR), percentage index of pod damage (PIPD) and percentage of spotted seeds (PSS). We assessed the parental lines IAC-100 (resistant) and FT-Estrela (susceptible), the progenies F2 and F4, 30 progenies F2:3, 30 progenies BC1F2:3 and 30 progenies BC2F2:3, besides the cultivars BRS Celeste and MGBR-46 (Conquista). Three field experiments, using randomized complete block design with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Insect resistance; Stink bugs; Heritability.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200020

The influence of animals from embryo transfer on the genetic evaluation of growth in Simmental beef cattle by using multi-trait models
Provedor de dados: 74
Autores: Mota,Rodrigo Reis; Lopes,Paulo Sávio; Marques,Luiz Fernando Aarão; Silva,Luciano Pinheiro da; Resende,Marcos Deon Vilela de; Torres,Robledo de Almeida.
The weight records from Simmental beef cattle were used in a genetic evaluation of growth with or without the inclusion of animals obtained by embryo transfer. A multi-trait model in which embryo transfer individuals were excluded (MTM1) contained 29,510 records from 10,659 animals, while another model without exclusion of these animals (MTM2) contained 62,895 weight records from 23,160 animals. The weight records were adjusted for ages of 100, 205, 365, 450, 550 and 730 days. The (co)variance components and genetic parameters were estimated by the restricted maximum likelihood method. The (co)variance components were similar in both models, except for maternal permanent environment variance. Direct heritabilities (h²d) in MTM1 were 0.04, 0.11, 0.20, 0.27,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Body weight; (co)variance components; Heritability.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000100007

Phenotypic recurrent selection in the common bean (Phaseolus vulgaris L) with carioca-type grains for resistance to the fungi Phaeoisariopsis griseola
Provedor de dados: 74
Autores: Amaro,Geovani Bernardo; Abreu,Ângela de Fátima Barbosa; Ramalho,Magno Antonio Patto; Silva,Flávia Barbosa.
The efficiency of recurrent selection was assessed in obtaining common bean (Phaseolus vulgaris L) plant lines resistant to the phytopathogenic fungi Phaeoisariopsis griseola. The base bean population was obtained from the partial diallel between seven lines with carioca-type grains and 10 sources of resistance to P. griseola. The plants most resistant to the pathogen were selected in the F2 (S0) generation of the populations (C-0). The best S0:1 plants that presented carioca-type grains were intercrossed to obtain cycle I (C-I). The same procedure was adopted to obtain cycles C-II to C-V. In each recurrent selection cycle, S0:1 progenies selected were also assessed in experiments carried out in Lavras, Brazil, always using as check the Carioca MG...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Angular-leaf-spot; Grain yield; Heritability; Phaseolus vulgaris; Response to selection.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000400014

Quantitative inheritance of some wheat plant traits
Provedor de dados: 74
Autores: Novoselovic,D.; Baric,Marijana; Drezner,G.; Gunjaca,J.; Lalic,A.
The objective of this study was to estimate gene effects and genetic variability for some quantitative traits of two winter wheat crosses (Soissons/Zitarka and Soissons/Sana) by generation mean analysis. In most cases a digenic epistatic model was sufficient to explain variation in generation means. The additive-dominance model was adequate for plant height and grain weight per spike of the longest culm. In two cases (grain yield per plant and single grain weight) these models failed to explain variation in generation means, implying the presence of higher order interactions or interactions between linked loci. Dominance effects and additive x additive epistasis were more important than additive effects and other epistatic components. Only complementary...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wheat; Quantitative traits; Joint scaling test; Gene effects; Heritability.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000100015

Genetic analyses of days to calving and their relationships with other traits in a Canchim cattle herd
Provedor de dados: 74
Autores: Mucari,Talita Buttarello; Alencar,Maurício Mello de; Barbosa,Pedro Franklin; Barbosa,Rogério Taveira.
Heritabilities and genetic correlations in a Canchim beef cattle herd were estimated using data on the following traits: male scrotal circumference at twelve months (SC12); days to first calving (DFC) for heifers; days to calving (DC) for cows; male and female weight (W) at twelve months (W12); heifer weight at the start of the first breeding season (WFBS) and at first calving (WFC); and cow weight at the start of the breeding season (WBS) and at calving (WC). Analyses of the DFC and DC traits were carried out excluding and including penalized (DFC P and DC P) non-calving females. The restricted maximum likelihood method was used, applying one-trait models for the DFC and DC analyses and two-trait models for analyses of DFC and DC combined with the other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Body weight; Days to calving; Days to first calving; Genetic correlation; Heritability; Scrotal circumference.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000600007

Genetic analysis of the infestation of females of the Caracu cattle breed by Horn Fly (Haematobia irritans irritans) (L.) (Diptera, Muscidae)
Provedor de dados: 74
Autores: Fraga,Angelina Bossi; Alencar,Maurício Mello de; Figueiredo,Leopoldo Andrade de; Razook,Alexander George; Cyrillo,Joslaine Noely dos Santos Gonçalves.
The objective of this study was to evaluate environmental factors that affect infestation of Caracu cattle breed by horn fly (Haematobia irritans) and to estimate genetic parameters for level of infestation. Infestation was evaluated on females from two herds in two consecutive years. Total number of flies on animals (FC) was counted, an infestation score (FS: 1 to 5) was recorded according to the estimated number of flies on animals, and number of parasites in photographs (FF) taken when the animals were evaluated was also counted. On each animal from one to eight observations were taken. A total of 3,836, 2,751 and 3,754 records from 718 animals were obtained for FC, FF and FS, respectively. The incidence of flies was lower during winter and higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Heritability; Horn fly counts; Repeatability.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000200011

Effect of lactation length adjustment procedures on genetic parameter estimates for buffalo milk yield
Provedor de dados: 74
Autores: Baldi,Fernando; Laureano,Monyka Marianna Massolini; Gordo,Daniel Gustavo Mansan; Bignardi,Annaiza Braga; Borquis,Rusbel Raul Aspilcueta; Albuquerque,Lucia Galvão de; Tonhati,Humberto.
The objectives of this study were to estimate the genetic parameters for milk yield unadjusted and adjusted for days in milk and, subsequently, to assess the influence of adjusting for days in milk on sire rank. Complete lactations from 90 or 150 days of lactation to 270 or 350 days in milk were considered in these analyses. Milk yield was adjusted for days in milk by multiplicative correction factors, or by including lactation length as a covariable in the model. Milk yields adjusted by different procedures were considered as different traits. Heritability estimates varied from 0.17 to 0.28. Genetic correlation estimates between milk yields unadjusted and adjusted for days in milk were greater than 0.82. Adjusting for days in milk affected the parameter...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlations; Heritability; Lactation length; Milk production; Rank correlations.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100012

Partitioning genetic effects due to embryo, cytoplasm and maternal parent for oil content in oilseed rape (Brassica napus L.)
Provedor de dados: 74
Autores: Wu,Jian-Guo; Shi,Chun-Hai; Zhang,Hai-Zhen.
Analysis of genetic main effects and genotype x environment (GE) interaction effects on the oil content of oilseed rape (Brassica napus L.) was conducted by using a genetic model for the quantitative traits of seeds in diploid plants. The experiments were carried out over two years with 8 parents and a diallel mating design, which produced F1 and F2 generations. We found that the oil content of rape was simultaneously controlled by embryo genetic effect, cytoplasmic effects and maternal genetic effect as well as GE interaction effects, with the cytoplasmic and maternal effects playing the main role. The results indicate that selection of maternal plants for high oil content would be more efficient than selection based on single seeds. Since the GE...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeding selection; Environmental interactions; Heritability; QTL.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000300023

Genetic parameters for faecal egg count, packed-cell volume and body-weight in Santa Inês lambs
Provedor de dados: 74
Autores: Lôbo,Raimundo N.B.; Vieira,Luiz S.; Oliveira,Amaury A. de; Muniz,Evandro N.; Silva,José M. da.
Worm infection is one of the main factors responsible for economic losses in sheep breeding in Brazil. Random regression analysis was used to estimate genetic parameters for the factors faecal egg-count (FEC), packed-cell volume (PCV) and body weight (BW) in Santa Inês lambs. Data from 119 female, offspring of nine rams, were collected between December, 2005 and December, 2006, from the experimental flock of Embrapa Tabuleiros Costeiros, the Brazilian Agricultural Research Corporation located in Frei Paulo, SE, Brazil. After weaning, females were drenched until the faecal egg count had dropped to zero. Two natural challenges were undertaken. FEC heritability was extremely variable, this increasing from 0.04 to 0.27 in the first challenge and from 0.01 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlations; Heritability; Legendre polynomials; Random regression.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200014

Genetic variation in growth traits and yield of rubber trees (Hevea brasiliensis) growing in the Brazilian state of São Paulo
Provedor de dados: 74
Autores: Gonçalves,Paulo de Souza; Moraes,Mário Luiz Teixeira de; Bortoletto,Nelson; Costa,Reginaldo Brito da; Gonçalves,Elaine Cristine Pifer.
Analysis of variance and covariance was preformed on growth traits (stem girth, bark thickness, total height gain and rubber yield) of 22 open-pollinated progenies of the rubber tree Hevea brasiliensis from an Asian Hevea collection introduced to Agronomic Institute (Instituto Agronômico, Campinas, São Paulo, Brazil; IAC) in 1952. This progeny trial was replicated at three sites in São Paulo state and it was found that at three years from sowing there was statistically significant variation for girth, bark thickness, height and rubber yield. An individual test sites, values of individual plant heritability for girth ranged from h= 0.36 to h= 0.89 whereas values for heritability for progeny means ranged from h= 0.77 to h= 0.87. These moderate and high...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Rubber tree; Heritability; Genetic parameters.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000500019

The quantitative genetic basis of female and male body size and their implications on the evolution of body size dimorphism in the house cricket Acheta domesticus (Gryllidae)
Provedor de dados: 74
Autores: Castillo,Raúl Cueva del.
Few theoretical and experimental studies have analyzed the genetic basis of body size dimorphism. Since the evolutionary response to selection depends of the genetic variance in a population it is to be expected that traits under selection would have smaller genetic variance than traits not affected by selection. The evolution of sexual size dimorphism is affected by the genetic correlation between females and males, with the most dimorphic traits showing smaller genetic correlations between the sexes. As result of the differences in the intensity of sexual selection between the sexes, it is expected that the levels of genetic variance would be larger in females than males. I analyzed the genetic additive variance underlying six traits of Acheta...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acheta domesticus; Body size; Dimorphism; Heritability; Sexual selection.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000500030

Selection and genetic gains for juvenile traits in progenies of Hevea in São Paulo State, Brazil
Provedor de dados: 74
Autores: Gonçalves,Paulo de Souza; Martins,Antonio Lúcio Mello; Bortoletto,Nelson; Saes,Luis Alberto.
Five yield traits were investigated in three-year-old progenies from open-pollinated rubber trees [Hevea brasiliensis (Willd. ex Adr. de Juss) Muell.-Arg.]. Twenty progenies were evaluated in a randomized, complete block design replicated three times using 10 plants per linear plot at the North Central Experimental Station in Pindorama, São Paulo State, Brazil. The characters evaluated included the average yield of rubber, growth vigor, bark thickness, total number of latex vessel rings and latex vessel size. Highly significant (p &lt; 0.01) genetic differences were observed among progenies for most traits. The genotypic variance components accounted for 13.2%, 12.3%, 9.4%, 3.4% and 0.23% of the phenotypic variance for yield, growth vigor, bark thickness,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Rubber tree; Heritability; Genetic parameters.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200014

Genetic parameters for growth, reproductive and maternal traits in a multibreed meat sheep population
Provedor de dados: 74
Autores: Lôbo,Ana Maria Bezerra Oliveira; Lôbo,Raimundo Nonato Braga; Paiva,Samuel Rezende; Oliveira,Sônia Maria Pinheiro de; Facó,Olivardo.
The genetic parameters for growth, reproductive and maternal traits in a multibreed meat sheep population were estimated by applying the Average Information Restricted Maximum Likelihood method to an animal model. Data from a flock supported by the Programa de Melhoramento Genético de Caprinos e Ovinos de Corte (GENECOC) were used. The traits studied included birth weight (BW), weaning weight (WW), slaughter weight (SW), yearling weight (YW), weight gain from birth to weaning (GBW), weight gain from weaning to slaughter (GWS), weight gain from weaning to yearling (GWY), age at first lambing (AFL), lambing interval (LI), gestation length (GL), lambing date (LD - number of days between the start of breeding season and lambing), litter weight at birth (LWB)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Age at first lambing; Genetic correlation; Heritability; Body weight; Litter weight.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000400016

Test-day milk yield as a selection criterion for dairy buffaloes (Bubalus bubalis Artiodactyla, Bovidae)
Provedor de dados: 74
Autores: Tonhati,Humberto; Cerón-Muñoz,Mário Fernando; Oliveira,João Ademir de; El Faro,Lenira; Lima,André Luís Ferreira; Albuquerque,Lucia Galvão de.
Due to the great demand for buffalo milk by-products the interest in technical-scientific information about this species is increasing. Our objective was to propose selection criteria for milk yield in buffaloes based on total milk yield, 305-day milk yield (M305), and test-day milk yield. A total of 3,888 lactations from 1,630 Murrah (Bubalus bubalis) cows recorded between 1987 and 2001, from 10 herds in the State of São Paulo, Brazil, were analyzed. Covariance components were obtained using the restricted maximum likelihood method applied to a bivariate animal model. Additive genetic and permanent environmental effects were considered as random, and contemporary group and lactation order as fixed effects. The heritability estimates were 0.22 for total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlations; Genetic parameters; Heritability; Selection efficiency.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000400012

Genetic parameters for milk, fat and protein yields in Murrah buffaloes (Bubalus bubalis Artiodactyla, Bovidae)
Provedor de dados: 74
Autores: Aspilcueta-Borquis,Rusbel Raúl; Sesana,Roberta Cristina; Berrocal,Milthon Honorio Munoz; Seno,Leonardo de Oliveira; Bignardi,Annaiza Braga; El Faro,Lenira; Albuquerque,Lucia Galvão de; Camargo,Gregório Miguel Ferreira de; Tonhati,Humberto.
The objective of the present study was to estimate genetic parameters for test-day milk, fat and protein yields and 305-day-yields in Murrah buffaloes. 4,757 complete lactations of Murrah buffaloes were analyzed. Co-variance components were estimated by the restricted maximum likelihood method. The models included additive direct genetic and permanent environmental effects as random effects, and the fixed effects of contemporary group, milking number and age of the cow at calving as linear and quadratic covariables. Contemporary groups were defined by herd-year-month of test for test-day yields and by herd-year-season of calving for 305-day yields. The heritability estimates obtained by two-trait analysis ranged from 0.15 to 0.24 for milk, 0.16 to 0.23 for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Test-day model; Accumulated productions; Heritability; Genetic correlations.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000100014

Allele frequency and selection efficiency in cross populations of Andean x Mesoamerican common beans (Phaseolus vulgaris L. Fabales, Fabaceae)
Provedor de dados: 74
Autores: Baldoni,Aisy B.; Ramalho,Magno A. Patto; Abreu,Ângela de Fátima B.
Strategies were investigated for improving efficiency in the use of segregating common bean (Phaseolus vulgaris) populations using crosses between the Andean cultivar BRS-Radiante and the Mesoamerican parent cultivar Carioca-MG by developing populations with 12.5%, 25%, 50%, 75% and 87.5% of the allele frequency of one of the parents. For each of the five populations we evaluated for two traits, the number of days to the beginning of flowering and grain yield (g plot-1), in the F2:3 (sown in February 2006) and F2:4 (sown in July 2006) generation progenies using 15 x 15 lattice design experiments, with 44 progenies (n = 220 plants) plus the two parents and three controls being evaluated for each generation. In terms of variability release, the populations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Backcross; Gene pools; Heritability; Phaseolus vulgaris; Selection gain.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000500019

Prediction of seed-yield potential of common bean populations
Provedor de dados: 74
Autores: Abreu,Ângela de Fátima Barbosa; Ramalho,Magno Antonio Patto; Santos,João Bosco dos.
Earliest possible prediction of seed-yield potential of autogamous crop populations increases breeding program efficiency by saving time and resources. Alternatives for obtaining seed-yield predictions were compared by evaluating four common-bean populations in F1 and F2 generations together with the parents. Mean components (m + a' and d) and variances were estimated. The potential of each population was predicted by using both these and the Jinks and Pooni (1976) procedure, which allows probability estimation of each population of originating lines surpassing a determined standard. Estimate efficiency was determined by evaluating performances of 62 F5:7 families from each population. Mean component m + a' estimates obtained for the F1 and F2 generations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Choice of parents; Heritability; Mean components; Common bean; Phaseolus vulgaris L.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000300013

Fragility in the 14q21q translocation region
Provedor de dados: 74
Autores: Denison,Stacy R.; Multani,Asha S.; Pathak,Sen; Greenbaum,Ira F.
Aphidicolin (APC)-induced chromosomal breakage was analyzed for women representing three generations of a single family and carrying a Robertsonian translocation rob(14q21q). Fluorescence in situ hybridization (FISH) analysis confirmed the dicentric constitution of the derived chromosome and indicated the absence of beta-satellite signal at the translocation region. Per-individual analysis of metaphases from APC-treated peripheral blood lymphocyte cultures identified significantly nonrandom chromosomal breakage at the translocation region in all three individuals examined. The APC-inducible fragility at the 14q21q translocation region suggests that this rearrangement was the result of chromosomal mutation at fragile site(s) in the progenitor chromosomes,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rob(14q21q); Robertsonian translocation; Fragile sites; Aphidicolin; Heritability.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000300003

Natural selection and family X location interaction in the common (dry) bean plant
Provedor de dados: 74
Autores: Pirola,Luís Henrique; Ramalho,Magno Antonio Patto; Carneiro,José Eustáquio S.; Abreu,Ângela de Fátima Barbosa.
Natural selection takes place while advancing generations of segregant populations of self pollinating species by the population (bulk) method. There is evidence that it maintains the individuals with greater grain yield. The question arises whether natural selection preserves the individuals which are more adapted only to the environment where the generation advance occurred, that is, if it contributes to increasing the genotype x environment interaction in the family assessment. This study was carried out to check this hypothesis in the common bean plant using families derived from a segregating population from a cross between the Carioca MG x ESAL 686 cultivars. The segregating populations increase in homozygosity was obtained by the population (bulk)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genotype x environment interaction; Heritability; Common bean; Phaseolus vulgaris L.; Natural selection.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000300016

Epistasis and genotype-by-environment interaction of grain protein content in durum wheat
Provedor de dados: 74
Autores: Bnejdi,Fethi; Gazzah,Mohamed El.
Parental, F1, F2, BC1 and BC2 generations of four crosses involving four cultivars of durum wheat (Triticum durum Desf.) were evaluated at two sites in Tunisia. A three-parameter model was found inadequate for all cases except crosses Chili x Cocorit 71 at site Sidi Thabet and Inrat 69 x Karim at both sites. In most cases a digenic epistatic model was sufficient to explain variation in generation means. Dominance effects (h) and additive x additive epistasis (i) (when significant) were more important than additive (d) effects and other epistatic components. Considering the genotype-by-environment interaction, the non-interactive model (m, d, h, e) was found adequate. Additive variance was higher than environmental variance in three crosses at both sites....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epistasis; Genotype x environment interaction; Heritability; Grain protein; Wheat.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000100021

Genetic parameter and correlation estimates of processing traits in half-sib progenies of tropical-adapted carrot germplasm
Provedor de dados: 75
Autores: Vieira,Jairo V; Silva,Giovani Olegario da; Boiteux,Leonardo S.
The estimate of the genetic parameters associated with processing (fresh-cut) traits, including root length (RL), is crucial for carrot breeding programs in tropical areas. The cultivar Alvorada is an important germplasm due to its resistance to nematodes, leaf blight, heat-tolerance, and high carotenoid content. Seventy-four 'Alvorada' half-sib progenies were evaluated during the summer of 2005 in the Federal District, Brazil, in a randomized complete block design with three replications. Thirteen competitive plants in each block were randomly selected and evaluated and/or classified for RL and for number of leaves (NL), leaf length (LL), root tip type (RT), root mass (RW), crown shape (CS), root diameter (RD), and xylem diameter (XD). The Pearson's...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Daucus carota; Heritability; Genetic correlation; Path analysis; Root length.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362012000100002

Morpho-agronomic characterization and estimates of genetic parameters in annatto plant
Provedor de dados: 75
Autores: Dias,Nilma O; Rebouças,Tiyoko NH; São José,Abel R; Amaral,Cláudio LF.
ABSTRACT Originally from tropical America, annatto is an important source of natural dyes for food, pharmaceutical and textile industries, especially for the increasing demand of this pigment substituting artificial dyes. The aim of this study was to evaluate genotypic variation of annatto cultivar Embrapa 37, aiming to generate subsidies for breeding programs as well as to help out the producers using vegetative propagation of superior genotypes. Therefore, the morphological characterization was carried out and estimates of genetic and phenotypic parameters, for production and quality of the fruits, were obtained. The results showed wide rate of genetic variability among the plants with low environmental influence on the phenotype for traits bixin...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bixa orellana; Natural dyes; Heritability; Genetic gain.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000200242

Genetic parameters estimation in King palm through a mixed mating system model
Provedor de dados: 75
Autores: Bovi,Marilene L. A.; Resende,Marcos Deon V. de; Spiering,Sandra H.
Overestimation of the genetic parameters is common in palms due to the occurrence of geitonogamy and the absence of self-incompatibility mechanisms. Data from nursery grown Archontophoenix palms were utilized, assuming a mixed mating system including random cross-pollination and selfing at different rates. The objective was to show the importance of knowing the mating system predominant and define breeding strategies for that genus. Twenty-four King palm half sib families were evaluated at nursery conditions using a randomised complete block design, with nine replications and eleven plants per plot. Ten months after sowing, traits such as diameter, height, number of green leaves and length of the leaf sheath of the second leaf, were individually measured....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Archontophoenix; Alexander palm; Bangalow palm; Heritability; Selection; Growth traits.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362003000100020

Determining the inheritance of agronomic traits in chili pepper
Provedor de dados: 75
Autores: Bento,Cíntia S; Rodrigues,Rosana; Sudré,Cláudia P; Medeiros,Artur M; Mathias,Vinícius AS; Gonçalves,Leandro SA.
ABSTRACT The Capsicum genus is widely studied in many countries but most of research focuses on C. annuum. Although its importance as potential genetic resource for breeding to disease resistance and fruit quality, studies on genetics and breeding in C. baccatum var. pendulum are still scarce and it still remains as an underexploited crop. This paper aimed to study the inheritance of agronomic characteristics, to estimate the genetic parameters for seven agronomic traits in C. baccatum var. pendulum, using generation mean analysis and to verify the existence of major genes and polygenes with additive and non-additive effects, using the method of maximum likelihood with the aid of Monogen software. The agronomic traits evaluated were: number of fruits per...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capsicum baccatum var. pendulum; Genetic control; Heritability; Major gene; Additive-dominant model; Segregating generation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362016000300367

Desempenho produtivo de ovinos mestiços Santa Inês, no Estado do Ceará.
Provedor de dados: 14
Autores: SILVA, F. L. R. da; LIMA, F. de A. M.; FIGUEIREDO, E. A. P. de.
bitstream/item/36453/1/PB-16.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Desenvolvimento ponderal; Raça nativa; Raça Santa Inês; Herdabilidade; Correlação genética; Brasil; Ceará; Native breed; Herança genética.; Ovino; Melhoramento; Performance.; Sheep; Animal performance; Breeding; Heritability; Genetic correlation; Brazil.
Ano: 1993
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/514248

Response to selection for growth in an interspecific hybrid between Oreochromis mossambicus and O. niloticus in two distinct environments
Provedor de dados: 5
Autores: De Verdal, Hugues; Rosario, Westly; Vandeputte, Marc; Muyalde, Nerafe; Morissens, Pierre; Baroiller, Jean-francois; Chevassus, Bernard.
The development of a saline tolerant tilapia strain able to grow fast is of importance in the Philippines, where 240 000 ha of brackish water ponds are available. To this end, founder hybridization between Oreochromis niloticus (with favorable growth traits) and O. mossambicus (with favorable salinity tolerance traits) was performed and followed by backcrossing with O. mossambicus to develop a strain highly tolerant to saline environments. Genetic selection for growth performance was subsequently conducted. The aim of the present study was to estimate growth performance and survival of the hybrid in two rearing environments following four generations of genetic selection.  A comparison between the hybrid and an internal reference line was performed in two...
Tipo: Text
Palavras-chave: Salinity tolerance; Selection; Hybridization; Genetic gain; Heritability; Survival rate.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00187/29836/28287.pdf

How to genetically increase fillet yield in fish: Relevant genetic parameters and methods to predict genetic gain
Provedor de dados: 5
Autores: Vandeputte, Marc; Fraslin, Clemence; Haffray, Pierrick; Bestin, Anastasia; Allal, Francois; Kocour, Martin; Prchal, Martin; Dupont-nivet, Mathilde.
Fillet yield (i.e. the proportion of edible muscle in a fish) is a key economic trait for species sold as fillets. Its genetic improvement is complicated by several of its characteristics 1) it is a ratio trait, 2) its numerator (fillet weight) and denominator (body weight) are strongly correlated (correlations in the range 0.89-0.99), 3) it offers little phenotypic variation and 4) it cannot be measured on alive breeding candidates. In a former study, we showed that it could be improved by selection, especially with three selection indices, fillet yield, residual fillet weight and a ratio-specific linear index. However, it is well known that the heritability of ratio traits does not permit a reliable prediction of genetic gains. As predictability of...
Tipo: Text
Palavras-chave: Aquaculture; Genetics; Heritability; Selection; Linear index; Residual fillet weight; Selection response; Simulation; Processing yields.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00612/72378/71390.pdf

Genetic relationship between koi herpesvirus disease resistance and production traits inferred from sibling performance in Amur mirror carp
Provedor de dados: 5
Autores: Zhao, Jinfeng; Prchal, Martin; Palaiokostas, Christos; Houston, Ross D.; Kause, Antti; Vandeputte, Marc; Vergnet, Alain; Bugeon, Jérôme; Bestin, Anastasia; Veselý, Tomáš; Pokorová, Dagmar; Piačková, Veronika; Pojezdal, Lubomír; Genestout, Lucie; Gela, David; Kroupová, Hana K.; Kocour, Martin.
Koi herpesvirus disease (KHVD) is currently the most serious threat to global carp farming. Prevention is a sensible strategy for tackling this disease and improved genetic resistance of carp strains is a desirable breeding goal. To study the potential for multitrait selection, the objective of the current study was to estimate the genetic correlations between KHVD resistance and production traits in Amur mirror carp. A total of 1500 fingerlings from four factorial crosses of five dams and ten sires were challenged with Koi herpesvirus (KHV). Juvenile growth-related traits were collected on the same individuals before the challenge test. Production traits were measured on siblings of the challenged population at different life stages (yearling to market...
Tipo: Text
Palavras-chave: Common carp; KHVD; Body shape traits; Slaughter yields; Heritability; Genetic correlation.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00604/71623/70066.pdf

What is the heritable component of spinal deformities in the European sea bass (Dicentrarchus labrax)?
Provedor de dados: 5
Autores: Bardon, Agnes; Vandeputte, Marc; Dupont-nivet, Mathilde; Chavanne, Herve; Haffray, Pierrick; Vergnet, Alain; Chatain, Beatrice.
Malformations in farmed fish are a prime research topic as it has a major impact on fish welfare and on the economical value of the product. In this study, the genetic component of spine deformities was estimated in European sea bass, a major species of Mediterranean aquaculture, with the use of a posteriori reconstruction of pedigree with microsatellites. Our population exhibited a very high malformation rate (81%),probably due to intense swimming of fish during pre-growing The heritability of global spine deformities was evaluated to be 0.21 +/- 0.04 on the underlying scale (033 +/- 0.06 for lordosis, 0.13 +/- 0.04 for scoliosis). Deformities scored by an internal or external examination turned out to be genetically the same trait (genetic...
Tipo: Text
Palavras-chave: Genetic correlations; Heritability; Growth; Deformities; Dicentrarchus labrax; European sea bass.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6768.pdf

Genetic variation for carcass quality traits in cultured sea bass (Dicentrarchus labrax)
Provedor de dados: 5
Autores: Saillant, Eric; Dupont-nivet, Mathilde; Sabourault, Marie; Haffray, Pierrick; Laureau, Stanislas; Vidal, Marie-odile; Chatain, Beatrice.
Genetic parameters for carcass quality traits were estimated in 27 families of sea bass (3 dams x 9 sires factorial mating design), raised mixed in the same tanks starting before hatching. O. spring parentage was determined a posteriori using 6 microsatellite loci. Carcass quality traits were recorded at 818 days post fertilization (mean standard length: 32.6 +/- 3.1 cm). Genetic parameters were estimated from the sire half sib variance and covariance components. Heritability of body weight (BW) and carcass processing traits (standardized to body weight) percent head weight (Head%), percent viscera weight (Viscera%) and percent visceral fat weight (VisceFat%) were relatively high ranging from 0.48 +/- 0.15 (Viscera%) to 0.87 +/- 0.23 (Head%); the estimate...
Tipo: Text
Palavras-chave: Dicentrarchus labrax; Communal testing; Microsatellites markers; Carcass quality; Heritability.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6355.pdf

Heritabilities and GxE interactions for growth in the European sea bass (Dicentrarchus labrax L.) using a marker-based pedigree
Provedor de dados: 5
Autores: Dupont Nivet, M; Vandeputte, Marc; Vergnet, Alain; Merdy, O; Haffray, P; Chavanne, H; Chatain, Beatrice.
253 full-sib families from 33 males and 23 females of European seabass were produced in a partly factorial mating design. All fish were reared in the same tank during 14 months, then 7000 of them were dispatched in four farms to different locations (France, Israel, Italy, Portugal) representing a wide variety of environmental conditions. Around 400 g mean weight, 1177 to 1667 fish in each site were weighed and length was measured. Condition factor (K) was calculated. Pedigrees were redrawn a posteriori using microsatellites markers: parental origin could be retraced for 99.2% of fish. Due to a high incidence of deformities, the useful sample size was reduced to 491-670 fish per site.   Maternal effects were small. Using a simple animal model, heritability...
Tipo: Text
Palavras-chave: Microsatellites; GxE interactions; Heritability; Growth; Seabass; Dicentrarchus labrax.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4404.pdf

The European sea bass: a key marine fish model in the wild and in aquaculture
Provedor de dados: 5
Autores: Vandeputte, Marc; Gagnaire, P.‐a.; Allal, Francois.
The European sea bass (Dicentrarchus labrax L.) is a marine fish of key economic and cultural importance in Europe. It is now more an aquaculture than a fisheries species (&gt;96% of the production in 2016), although modern rearing techniques date back only from the late 1980s. It also has high interest for evolutionary studies, as it is composed of two semispecies (Atlantic and Mediterranean lineages) that have come into secondary contact following the last glaciation. Based on quantitative genetics studies of most traits of interest over the past 10–15 years, selective breeding programs are now applied to this species, which is at the beginning of its domestication process. The availability of a good quality reference genome has accelerated the...
Tipo: Text
Palavras-chave: Dicentrarchus labrax; Genetics; Heritability; Population genetics.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00486/59752/62858.pdf

How to genetically increase fillet yield in fish: New insights from simulations based on field data
Provedor de dados: 5
Autores: Fraslin, Clemence; Dupont-nivet, Mathilde; Haffray, Pierrick; Bestin, Anastasia; Vandeputte, Marc.
Fillet yield (i.e. the proportion of edible flesh from a given amount of fish) is a trait of high economic interest for species sold as fillets. Improving it by selective breeding is not an easy task, as it is a ratio trait, which causes mathematical difficulties. It is moreover a specific ratio where numerator (fillet weight) and denominator (body weight) are very strongly correlated (genetic and phenotypic correlations in the range 0.89–0.99). This led some authors to conclude that they have the same genetic and phenotypic basis, precluding selection for improved fillet yield. In this study, we propose to study fillet yield as a component of two traits, fillet weight and waste weight (waste weight = body weight-fillet weight, so the sum of head, bones,...
Tipo: Text
Palavras-chave: Aquaculture; Genetics; Heritability; Selection; Processing yields.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00415/52599/53430.pdf

First evaluation of resistance to both a California OsHV-1 variant and a French OsHV-1 microvariant in Pacific oysters
Provedor de dados: 5
Autores: Divilov, Konstantin; Schoolfield, Blaine; Morga, Benjamin; Dégremont, Lionel; Burge, Colleen A.; Mancilla Cortez, Daniel; Friedman, Carolyn S.; Fleener, Gary B.; Dumbauld, Brett R.; Langdon, Chris.
Background Variants of the Ostreid herpesvirus 1 (OsHV-1) cause high losses of Pacific oysters globally, including in Tomales Bay, California, USA. A suite of new variants, the OsHV-1 microvariants (μvars), cause very high mortalities of Pacific oysters in major oyster-growing regions outside of the United States. There are currently no known Pacific oysters in the United States that are resistant to OsHV-1 as resistance has yet to be evaluated in these oysters. As part of an effort to begin genetic selection for resistance to OsHV-1, 71 families from the Molluscan Broodstock Program, a US West Coast Pacific oyster breeding program, were screened for survival after exposure to OsHV-1 in Tomales Bay. They were also tested in a quarantine laboratory in...
Tipo: Text
Palavras-chave: Ostreid herpesvirus 1; Crassostrea gigas; Heritability; Breeding.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00598/70974/69206.pdf

Minimizing maternal effect in salmonid families mixed since eyed stages and a posteriori DNA-pedigreed
Provedor de dados: 5
Autores: Haffray, Pierrick; Vandeputte, Marc; Petit, V.; Pincent, Cedric; Chatain, Beatrice; Chapuis, H.; Meriaux, J. C.; Coudurier, B.; Quillet, E.; Dupont-nivet, M.
Application of DNA parentage assignment for commercial selection in aquaculture is still rare. An experiment was performed to quantify and to minimize maternal effects on growth in rainbow trout. Six hundred families were reared until 198 day post fertilization (dpf) according to two different procedures. In the first procedure (NORM), all families were pooled at eyed stage. In the second procedure (MIN), where maternal effects due to differences in egg size were expected to be minimal, the spawns were divided into sub-groups with similar mean egg weight at eyed stage. These sub-groups were then pooled when they achieved the same mean body length (147 dpf). Genetic parameters were estimated for body weight, body length and condition factor at 198 dpf, with...
Tipo: Text
Palavras-chave: Rainbow trout; Fingerprint; Maternal effect; Heritability; Growth; Triploid.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00115/22639/20395.pdf

Summer mortality of hatchery-produced Pacific oyster spat (Crassostrea gigas). II. Response to selection for survival and its influence on growth and yield
Provedor de dados: 5
Autores: Degremont, Lionel; Bedier, Edouard; Boudry, Pierre.
Response to divergent selection for "high" and "low" survival during the summer period, from July to October, was investigated in juvenile (six-month-old) Pacific oysters, Crassostrea gigas, by producing two sets of progenies in 2002 (Generation 2) and three sets of progenies in 2003 (Generation 3). A strict between-family approach was used and resistance of these selected progenies to summer mortality was assessed in three sites along French coasts, to determine their response to selection and estimate realized heritability of the trait. A significant difference in survival was observed between the "high" and "low" selected groups at all sites for all sets of progenies, indicating a significant genetic component. High realized heritabilities for survival...
Tipo: Text
Palavras-chave: Crassostrea gigas; Heritability; Juveniles; Summer mortality; Survival; Growth.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/2009/publication-6950.pdf

Estimation of Genetic Parameters of Fatty Acids Composition in Flesh of Market Size Common Carp (Cyprinus carpio L.) and Their Relation to Performance Traits Revealed that Selective Breeding Can Indirectly Affect Flesh Quality
Provedor de dados: 5
Autores: Prchal, Martin; Vandeputte, Marc; Gela, David; Dolezal, Marek; Blichtova, Hana; Rodina, Marek; Flaishans, Martin; Kocour, Martin.
Fish are a rich source of omega-3 polyunsaturated fatty acids (n-3 PUFAs) and thus, they should be an integral part of human diet at least twice a week. As a result, high attention has been devoted to the improvement of fatty acids (FA) content in the flesh of farmed fish through nutrition. Conversely, there are very few data on the potential of selective breeding to improve FA composition in fish. We estimated genetic parameters of fillet fatty acid content and performance traits in market size common carp cultured under semi-intensive pond conditions. The experimental stock arose through factorial mating of 7 dams and 36 sires. All families were reared communally. Pedigree was reconstructed with microsatellite markers, and 158 individuals were dressed...
Tipo: Text
Palavras-chave: Genetic correlations; Genetic improvement; Growth; Heritability; Slaughtering traits; Supplemental feeding.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00449/56043/57558.pdf

Quantifying the genetic parameters of feed efficiency in juvenile Nile tilapia Oreochromis niloticus
Provedor de dados: 5
Autores: De Verdal, Hugues; Vandeputte, Marc; Mekkawy, Wagdy; Chatain, Beatrice; Benzie, John A. H.
Background: Improving feed efficiency in fish is crucial at the economic, social and environmental levels with respect to developing a more sustainable aquaculture. The important contribution of genetic improvement to achieve this goal has been hampered by the lack of accurate basic information on the genetic parameters of feed efficiency in fish. We used video assessment of feed intake on individual fish reared in groups to estimate the genetic parameters of six growth traits, feed intake, feed conversion ratio (FCR) and residual feed intake in 40 pedigreed families of the GIFT strain of Nile tilapia, Oreochromis niloticus. Feed intake and growth were measured on juvenile fish (22.4g mean body weight) during 13 consecutive meals, representing 7days of...
Tipo: Text
Palavras-chave: Feed conversion ratio; Tilapia; Heritability; Genetic estimations; Correlations.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00469/58115/60551.pdf

Crossing phenotype heritability and candidate gene expression in grafted black-lipped pearl oyster Pinctada margaritifera, an animal chimera
Provedor de dados: 5
Autores: Blay, Carole; Planes, Serge; Ky, Chin-long.
Grafting mantle tissue of a donor pearl oyster into the gonad of a recipient oyster results in the formation of a chimera, the pearl sac. The phenotypic variations of this chimera are hypothesized to be the result of interactions between the donor and recipient genomes. In this study, the heritability of phenotypic variation and its association with gene expression were investigated for the first time during P. margaritifera pearl production. Genetic variance was evaluated at different levels, 1) before the graft operation (expression in graft tissue), 2) after grafting (pearl sac tissue expression in chimera) and 3) on the product of the graft (pearl phenotype traits) based on controlled bi-parental crosses and the F1 generation. Donor related genetic...
Tipo: Text
Palavras-chave: Gene expression; Heritability; Pearl oyster; Phenotype; Pinctada margaritifera.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00433/54505/55876.pdf

How could fully scaled carps appear in natural waters in Madagascar?
Provedor de dados: 5
Autores: Hubert, Jean-noel; Allal, Francois; Hervet, Caroline; Ravakarivelo, Monique; Jeney, Zsigmond; Vergnet, Alain; Guyomard, Rene; Vandeputte, Marc.
The capacity of organisms to rapidly evolve in response to environmental changes is a key feature of evolution, and studying mutation compensation is a way to evaluate whether alternative routes of evolution are possible or not. Common carps (Cyprinus carpio) carrying a homozygous loss-of-function mutation for the scale cover gene fgfr1a1, causing the 'mirror' reduced scale cover, were introduced in Madagascar a century ago. Here we show that carps in Malagasy natural waters are now predominantly covered with scales, though they still all carry the homozygous mutation. We also reveal that the number of scales in mutated carps is under strong polygenic genetic control, with a heritability of 0.49. As a whole, our results suggest that carps submitted to...
Tipo: Text
Palavras-chave: Evolution; Mutation compensation; Heritability.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00356/46681/46725.pdf

Estimates of heritability and genotype-environment interactions for body weight in sea bass (Dicentrarchus labrax L.) raised under communal rearing conditions
Provedor de dados: 5
Autores: Saillant, Eric; Dupont Nivet, Mathilde; Haffray, Pierrick; Chatain, Beatrice.
Genetic parameters for somatic growth rate in sea bass were estimated in two experiments where 27 (year-class 1997) to 30 (year-class 1998) families of sea bass (3 dams mated with 9-10 sires according to a full factorial design) were raised mixed in the same tanks starting shortly before hatching (48 h post fertilization). Trials were performed under two temperature (experiment 1, 1997: group high temperature (HT) and group low temperature (LT)) and two density regimes (experiment 2, 1998: group high density (HD) and group low density (LD)) with a subset of the mating design (18 families) being reproduced in the two experiments. All the fish were genotyped at 3-6 microsatellite loci which allowed them to be assigned to the individual breeders used in the...
Tipo: Text
Palavras-chave: Genotype x environment interaction; Communal rearing; Microsatellites markers; Dicentrarchus labrax; Growth; Heritability.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1706.pdf

Response to selection for increasing resistance to the spring mortality outbreaks in Mytilus edulis occurring in France since 2014
Provedor de dados: 5
Autores: Degremont, Lionel; Maurouard, Elise; Rabiller, Manuella; Glize, Philippe.
Massive spring mortality outbreaks have been reported in Mytilus spp. in France since 2014. The main areas affected are the Pertuis Charentais Sounds and the coast of the Pays de la Loire, which cultivate mainly M. edulis, and the putative causal agents remain unknown. We report the results of the first generation of mass selection focused on survival and resistance to the spring mortality in M. edulis. Two stocks of mussels were sampled in the Pertuis Charentais Sounds in 2014; one of these went through a spring mortality outbreak and the survivors were used to produce the selected stock, while the second stock was M. edulis considered to be naïve against the putative causal agents of the mortality outbreak and was used to produce the control stock. A...
Tipo: Text
Palavras-chave: Spring mortality; Survival; Mytilus edulis; Heritability; Selection.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00505/61619/65530.pdf

Genetic variation of resistance to Viral Nervous Necrosis and genetic correlations with production traits in wild populations of the European sea bass ( Dicentrarchus labrax )
Provedor de dados: 5
Autores: Khanh, Doan Quoc; Vandeputte, Marc; Chatain, Beatrice; Haffray, Pierrick; Vergnet, Alain; Breuil, Gilles; Allal, Francois.
Viral Nervous Necrosis (VNN) disease is considered as one of the most serious threats for European sea bass cultured in Mediterranean Sea, with no simple and effective procedures to treat this disease. In this study, 1472 offspring resulting from artificial full factorial mating of western Mediterranean dams with sires from four different wild populations of European sea bass (Northern Atlantic, NAT; Western Mediterranean, WEM; Northern-East Mediterranean, NEM; and Southern-East Mediterranean, SEM) were challenged by experimental infection to W80 betanodavirus strain in order to evaluate genetic variations for VNN resistance among populations and genetic correlations between VNN resistance and production traits. The results showed a large variation of VNN...
Tipo: Text
Palavras-chave: VNN disease; VNN resistance; Heritability; Genetic correlation.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00385/49612/50124.pdf

Quantitative genetic variation for post-stress cortisol and swimming performance in growth-selected and control populations of European sea bass (Dicentrarchus labrax)
Provedor de dados: 5
Autores: Vandeputte, Marc; Porte, J. D.; Auperin, B.; Dupont-nivet, M.; Vergnet, Alain; Valotaire, C.; Claireaux, Guy; Prunet, P.; Chatain, Beatrice.
Sea bass is a major species in Mediterranean aquaculture, and is now being subject to selective breeding programs for faster growth. In terrestrial species, it was demonstrated that fast growth may be linked to a correlated degradation of fitness traits. In this experiment, we evaluated 600 young sea bass from a factorial mating of 76 sires and 13 dams. The sires were from four genetic groups, wild (W), domesticated (D), and selected for growth (2 groups, M and P). The 600 offspring were submitted to two acute confinement stress challenges at 6 weeks intervals, and plasma cortisol at one hour post stress was measured. The same fish were also submitted to two swimming challenges at a 5 days interval, where the maximum sustained swimming speed (Umax) of each...
Tipo: Text
Palavras-chave: Aquaculture; Selective breeding; Stress response; Maximum sustained swimming speed; Heritability; Correlated response.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00308/41955/41218.pdf

Family effect on cultured pearl quality in black-lipped pearl oyster Pinctada margaritifera and insights for genetic improvement
Provedor de dados: 5
Autores: Ky, Chin-long; Blay, Carole; Sham-koua, Manaarii; Vanaa, Vincent; Lo, Cedrik; Cabral, Philippe.
Individual Pinctada margaritifera molluscs were collected from the Takapoto atoll (Tuamotu Archipelago, French Polynesia) and used to produce ten first generation full-sib families in a hatchery system, following artificial breeding protocols. After three years of culture, these progenies were transferred to Rangiroa atoll (Tuamotu Archipelago, French Polynesia) and tested for their potential as graft donors. A large-scale grafting experiment of 1500 grafts was conducted, in which a single professional grafter used ten individual donor oysters from each of the ten families, grafting 15 recipient oysters from each donor. The recipient oysters were all obtained from wild spat collection in Ahe (Tuamotu Archipelago, French Polynesia). After 18 months of...
Tipo: Text
Palavras-chave: Cultured pearl oyster; Pearl quality; Progeny effects; Heritability; Genetic selection; Pinctada margaritifera; French Polynesia.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00152/26310/24380.pdf

In search for indirect criteria to improve feed utilization efficiency in sea bass (Dicentrarchus labrax) Part II: Heritability of weight loss during feed deprivation and weight gain during re-feeding periods
Provedor de dados: 5
Autores: Grima, Laure; Chatain, Beatrice; Ruelle, Francois; Vergnet, Alain; Launay, Amandine; Mambrini, Muriel; Vandeputte, Marc.
Selective breeding to improve residual feed intake (RFI) in sea bass (Dicentrarchus labrax) is a major goal that would optimize economic gain while minimizing the environmental impact of production. Due to the difficulty in accurately measuring individual feed intake, no selective breeding program has yet been started. In a previous study, we identified a criterion phenotypically related to RFI variations: the loss of weight during feed deprivation, FD. Moreover, an additional composite criterion (CC) integrating both FD and weight gain during subsequent re-feeding (RF) was closely related to RFI, even though the relationship was only close to significance (P=0.06). The aim of the present study was to estimate the heritability of these two traits, in order...
Tipo: Text
Palavras-chave: European sea bass; Dicentrarchus labrax; Feed efficiency; Heritability; Genetic parameters; Residual feed intake; Feed deprivation; Compensatory growth; Selective breeding.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00004/11529/8213.pdf

Investigation of morphological predictors of fillet and carcass yield in European sea bass (Dicentrarchus labrax) for application in selective breeding
Provedor de dados: 5
Autores: Vandeputte, Marc; Puledda, Antonio; Tyran, Anne Sophie; Bestin, Anastasia; Coulombet, Celine; Bajek, Aline; Baldit, Gwenaelle; Vergnet, Alain; Allal, Francois; Bugeon, Jerome; Haffray, Pierrick.
Genetic parameters for carcass and fillet percentage were estimated in 760 European sea bass reared under commercial conditions and slaughtered at 573 days post fertilization (395 g mean body weight). Phenotyped fish were the offspring of 45 sires and 20 dams crossed in a factorial mating design. Pedigrees were re-constructed with 90.7% success using 12 microsatellites. The heritability of fillet yield was moderately low (0.21), while it was high for carcass yield (0.57). Both traits were poorly correlated (− 0.01 to 0.28) making space for their combined improvement. We investigated different predictors derived from measurement of surfaces on digital pictures and ultrasound measurements at several points of the body. The accuracy of the phenotypic...
Tipo: Text
Palavras-chave: Ultrasound tomography; Genetics; Heritability; Indirect selection; Processing yields.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00361/47217/47173.pdf

Genotype by environment interactions for growth in European seabass (Dicentrarchus labrax) are large when growth rate rather than weight is considered
Provedor de dados: 5
Autores: Dupont-nivet, Mathilde; Karahan-nomm, Bilge; Vergnet, Alain; Merdy, Olivier; Haffray, Pierrick; Chavanne, Herve; Chatain, Beatrice; Vandeputte, Marc.
Two hundred fifty three full-sib families from 33 males and 23 females of European seabass were produced in a partly factorial mating design. All fish were reared in the same tank for 14 months until reaching mean weight of 35 g. then 7000 of them were individually tagged and weighed, and dispatched to four farms in different locations (France, Israel, Italy and Portugal) representing a wide variety of environmental conditions. Around mean weight of 400 g. 1177 to 1667 fish at each site were weighed. Daily growth coefficient (DGC) was calculated. Pedigrees were successfully redrawn for 99.2% of fish using microsatellite markers. Genetic correlations between sites were high for body weight (&gt;0.80 in all cases but one, i.e., five cases over six), but only...
Tipo: Text
Palavras-chave: Dicentrarchus labrax; Seabass; Growth; Daily growth coefficient; Heritability; G x E interactions; Aquaculture.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12256/9227.pdf

Genetic variation for growth at one and two summers of age in the common carp (Cyprinus carpio L.): Heritability estimates and response to selection
Provedor de dados: 5
Autores: Vandeputte, Marc; Kocour, M; Mauger, S; Rodina, M; Launay, A; Gela, D; Dupont Nivet, M; Hulak, M; Linhart, O.
We estimated the heritability of growth-related traits (weight and length at ages one summer, first spring and two summers) in a synthetic mirror carp strain (HSM) in the Czech Republic. The four generation pedigree was obtained from parentage assignment of three factorial mating designs with microsatellite markers, and included 195 fish without phenotypes (48 G0, 147 G1) and 1321 fish with phenotypes (674 G2, 647 G3). Animal model heritability estimates over generations were in the range 0.21-0.33 for length and in the range 0.31-0.44 for weight. The genetic correlation between length and weight was high (0.97). The correlations between growth measurements in the first and in the second summer of age were moderate to low (0.34-0.67). Divergent selection...
Tipo: Text
Palavras-chave: Quantitative genetics; Performance; Microsatellites; Parentage assignment; Realized heritability; Selection response; Selection; Growth; Heritability; Cyprinus carpio; Common carp.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4076.pdf

Evolution of morphological but not aggressiveness‐related traits following a major resistance breakdown in the poplar rust fungus,  Melampsora larici‐populina
Provedor de dados: 5
Autores: Maupetit, Agathe; Fabre, Bénédicte; Pétrowski, Jérémy; Andrieux, Axelle; De Mita, Stéphane; Frey, Pascal; Halkett, Fabien; Hayden, Katherine.
Crop varieties carrying qualitative resistance to targeted pathogens lead to strong selection pressure on parasites, often resulting in resistance breakdown. It is well known that qualitative resistance breakdowns modify pathogen population structure but few studies have analysed the consequences on their quantitative aggressiveness‐related traits. The aim of this study was to characterize the evolution of these traits following a resistance breakdown in the poplar rust fungus, Melampsora larici‐populina. We based our experiment on three temporal populations sampled just before the breakdown event, immediately after and four years later. First, we quantified phenotypic differences among populations for a set of aggressiveness traits on a universally...
Tipo: Text
Palavras-chave: Disease-associated traits; Heritability; Mixed model; Plant pathogen; Q(ST)-F(ST)comparisons; Temporal sampling.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00652/76396/77420.pdf

Genetic parameters of in-vivo prediction of carcass, head and fillet yields by internal ultrasound and 2D external imagery in large rainbow trout (Oncorhynchus mykiss)
Provedor de dados: 5
Autores: Haffray, Pierrick; Bugeon, Jerome; Rivard, Quentin; Quittet, Benjamin; Puyo, Sophie; Allamelou, Jean Michel; Vandeputte, Marc; Dupont-nivet, Mathilde.
Selection to improve processing yields relies on sib selection, in which live candidates are ranked according to their family breeding value. This approach limits genetic progress, as it only exploits genetic variability between families and not within them. Indirect criteria measured on live candidates could overcome this limitation. The present study (1) proposes a procedure to identify indirect criteria to predict processing yields in rainbow trout (head, carcass and fillet yields), (2) estimates genetic parameters of these indirect criteria, and (3) predicts relative genetic gains in processing yields using full-sib selection or indirect individual selection on those indirect criteria. DNA-pedigreed all-female rainbow trout Oncorhynchus mykiss (n =...
Tipo: Text
Palavras-chave: Salmonids; Heritability; Fillet yield; Selection; Aquaculture; Morphometry.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00157/26847/25249.pdf

First Evidence of Realized Selection Response on Fillet Yield in Rainbow Trout Oncorhynchus mykiss, Using Sib Selection or Based on Correlated Ultrasound Measurements
Provedor de dados: 5
Autores: Vandeputte, Marc; Bugeon, Jérôme; Bestin, Anastasia; Desgranges, Alexandre; Allamellou, Jean-michel; Tyran, Anne-sophie; Allal, Francois; Dupont-nivet, Mathilde; Haffray, Pierrick.
Fillet yield, the proportion of edible fillet relative to body weight, is a major trait to improve in fish sold processed, as it has a direct impact on profitability and can simultaneously decrease the environmental impact of producing a given amount of fillet. However, it is difficult to improve by selective breeding, because it cannot be measured on live breeding candidates, its phenotypic variation is low, and, as a ratio, it is not normally distributed and a same change in fillet yield can be the result of different changes in fillet weight and body weight. Residual headless gutted carcass weight (rHGCW) is heritable and highly genetically correlated to Fillet% in rainbow trout, and can be predicted by the ratio of abdominal wall thickness to depth of...
Tipo: Text
Palavras-chave: Aquaculture; Fillet yield; Selective breeding; Selection response; Production efficiency; Heritability.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00599/71121/69423.pdf

Summer mortality of hatchery-produced Pacific oyster spat (Crassostrea gigas). I. Estimation of genetic parameters for survival and growth
Provedor de dados: 5
Autores: Degremont, Lionel; Ernande, Bruno; Bedier, Edouard; Boudry, Pierre.
The multidisciplinary project "MOREST" aims to improve our understanding of causes of summer mortality in Crassostrea gigas juveniles in France and to reduce its impact on oyster production. As pail of the MOREST project, 43 full-sib families nested within 17 half-sib families were produced, planted out and tested in 3 sites during summer 2001 to assess to what extent genetic variability exists for this trait. A strong genetic basis was found for survival as narrow-sense heritability estimates ranged from 0.47 to 1.08, with higher values in sites where summer mortality was higher. Genetic correlations across sites were positive and very high for survival, indicating no genotype by environment interaction. In contrast, lower genetic variation was observed...
Tipo: Text
Palavras-chave: Growth; Survival; Juveniles; Heritability; Crassostrea gigas.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2457.pdf

Signature d'expression de gènes, Marqueur prédictif de capacités de survie chez l'huître Crassostrea gigas
Provedor de dados: 5
Autores: Bachere, Evelyne; Degremont, Lionel; Piquemal, David; Roman, Bruno; Noguier, Florian.
Dans le contexte des mortalités massives d'huîtres Crassostrea gigas, les mécanismes moléculaires et les bases génétiques impliquées dans la capacité de survie des huîtres ont été explorées par des approches de génomique à très haut débit. Ces travaux se sont centrés dans un premier temps sur la survie à des infections par des Vibrio virulents pour lesquels des infections expérimentales étaient reproductibles et standardisées en laboratoire. Ces analyses ont conduit à la mise en évidence d'une série de gènes dont l’expression peut prédire la capacité des huîtres à survivre aux infections à vibrios (Rosa et al. 2012). Depuis 2013, les travaux ont permis la validation de la signature de survie qui a pu être corrélée avec les capacités de survie des huîtres...
Tipo: Text
Palavras-chave: Huître creuse; Signature d'expression de gènes; QPCR; Biostatistique; Capacité de survie; Phénotypage; Héritabilité; Pacific oyster; Gene expression signature; QPCR; Biostatistics; Survival capacity; Phenotyping; Heritability.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00434/54551/55925.pdf

A polygenic hypothesis for sex determination in the European sea bass - Dicentrarchus labrax
Provedor de dados: 5
Autores: Vandeputte, Marc; Dupont Nivet, M; Chavanne, H; Chatain, Beatrice.
Polygenic sex determination, although suspected in several species, is thought to be evolutionarily unstable and has been proven in very few cases. In the European sea bass, temperature is known to influence the sex ratio. We set up a factorial mating, producing 5.893 individuals from 253 full-sib families, all reared in a single batch to avoid any between-families environmental effects. The proportion of females in the offspring was 18.3%, with a large variation between families. Interpreting sex as a threshold trait, the heritability estimate was 0.62 +/- 0.12. The observed distribution of family sex ratios was in accordance with a polygenic model or with a four-sex-factors system with environmental variance and could not be explained by any genetic...
Tipo: Text
Palavras-chave: Dicentrarchus labrax; Fish; Growth; Heritability; Sex ratio.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3526.pdf

HERITABILITY OF STING CHARACTERS IN AFRICANIZED HONEYBEES
Provedor de dados: 79
Autores: MELO,A.; MALASPINA,O.; DINIZ-FILHO,J. A. F.
In this paper we proposed to estimate the heritability of seven morphological characters that compose the sting apparatus of the Africanized honeybee workers. An experimental design to estimate genetic parameters was based on the method developed by Oldroyd and Moran(9). This method was modified to eliminate within-colony environmental effects associated with the additive genetic variance. The estimated h&lt;img SRC="http:/img/fbpe/jvat/v3n2/image1800.gif"&gt; values ranged from 0.17 ± 0.11 (maximum width of bulb of sting stylet and height of the valve of right lancet) to 0.74 ± 0.30 (length of the lancet).
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apis mellifera; Honeybees; Heritability; Sting.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79301997000200003

Estimation of Heritability for Somatic Cell Score of Holstein Cows in Hokkaido
Provedor de dados: 19
Autores: 三浦, 伸也; 鈴木, 三義.
(社)北海道酪農検定検査協会の検定日記録を用い，体細胞スコアに対する影響要因を明らかにし，遺伝率を推定した．データは北海道酪農検定検査協会により，1991年2月から2003年3月までに集積された初産の869,114頭からの8,986,351の検定日記録，2産は619,883頭（6,370,190記録），3産は409,320頭（4,194,475記録）に関する泌乳量と体細胞スコアである．体細胞スコアの上昇により，乳量，乳成分量は減少を示し，とくにスコア6以上で急激な減少を示した．体細胞スコアの遺伝率は，Wilminkの泌乳曲線を利用した反復率モデルで，初産〜3産まで0.08，0.07，0.07と推定され，産次間での大きな変動は認められなかった．ルシャンドル多項式を利用した変量回帰モデルを用いた遺伝率推定値は，Wilminkの関数により得られたものより高く，とくに分娩直後および，乾乳前において高く推定された．モデル内の次数を2次から5次まで変化させることによる大幅な遺伝率の変化は認められなかったので，計算時間等を考慮すると3次程度が妥当な次数と考えられる．閾値モデルによる推定遺伝率は分析の中ではもっとも高く推定され，その有効性が示唆されたが，これに関してはさらに実用的な見地からの研究が望まれる．
Palavras-chave: Somatic cell score; Heritability; Random regression; Threshold model; Holstein.
Ano: 2006
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2598

量的形質の表現型変異におよぼす環境効果と遺伝子型と環境との相互作用効果
Provedor de dados: 19
Autores: Miura, Hideho; 三浦, 秀穂.
Palavras-chave: Genotype-environment interaction; Heritability; Nicotiana rustica; Selection; 遺伝子型と環境との相互作用; 遺伝力; ルスチカタバコ; 選抜.
Ano: 1991
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1674

The Relationship between the Body Measurements of Cows and the Growth Traits of their Calves in Japanese Black Cattle
Provedor de dados: 19
Autores: 口田, 圭吾; 千葉, 和義; 山岸, 敏宏; 内田, 宏; 西田, 朗; Kuchida, Keigo; Chiba, Kazuyoshi; Yamagishi, Toshihiro; Uchida, Hiroshi; Nishida, Akira.
Palavras-chave: Japanese Black cattle; Body measurements of cows; Growth records; Heritability.
Ano: 1994
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/934

Heritability Estimates of Some Clutch Traits in the Laying Hen
Provedor de dados: 19
Autores: Luc, Kieu Minh; Miyoshi, Syunzou; Suzuki, Mitsuyoshi; Mitsumoto, Takatsugu.
Palavras-chave: Clutch traits; Multiphasic model; Laying hen; Heritability.
Ano: 1996
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/450

Assessment of opportunities to map pearl millet tolerance to salinity during germination and early seedling growth
Provedor de dados: 30
Autores: Mukhopadhyay, R.
Palavras-chave: Millets; Tolerance; Genotypes; Phenotypes; Genetic markers; Genomes; Heritability; Soil salinization; Feed crops; Humus.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3215

Response of Selected Sorghum Lines to Soil Salinity-Stress under Field Conditions
Provedor de dados: 30
Autores: Ramesh, S.
Palavras-chave: Soil salinization; Sorghum; Hybrids; Heritability; Phenotypes; Genotypes; Grain; Statistical methods; Genetic improvement; Tolerance.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3261

Field Screening for Drought Tolerance in Crop Plants with Emphasis on Rice
Provedor de dados: 30
Palavras-chave: Crops; Weather hazards; Phenotypes; Tolerance; Drought stress; Genotypes; Breeds (animals); Pigeonpeas; Heritability.
Ano: 2002
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3716

Genotype × environment interactions in food-feed traits in Pearl Millet cultivars
Provedor de dados: 30
Autores: Hash, C.T.
Palavras-chave: Nutritive value; Millets; Grain; Heritability; Yields; Quality; Location; Nitrogen; Plant production; Arid zones.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3209

Evaluation of medium maturity, high-tillering Pearl Millet population diallel in Niger
Provedor de dados: 30
Autores: Haussmann, B.I.G.
Palavras-chave: Genetic techniques; Population genetics; Crossing over; Millets; Grain; Breeds (animals); Heritability; Genetic variation; Yields; Hybrids.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3205

Forage yield and quality in pigeonpea germplasm lines
Provedor de dados: 30
Autores: Alexander, G.
Palavras-chave: Pigeonpeas; Organic acids; Animal nutrition; Heritability; Nitrogen; Germplasm; Wet season; Dry matter; Organic matter; Biological phenomena.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3284

Prospects of breeding for micronutrients and β-carotene-dense sorghums
Provedor de dados: 30
Autores: Reddy, B.V.S.,( Belum V. S. Reddy ).
Palavras-chave: Carotenes; Grain; Organic acid salts; Agronomic characters; Heritability; Germplasm; Phenotypes; Genetic variation; Sorghum; Zinc.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3256

Genetic selection Pinus greggii progeny to the establishment of seed orchards
Provedor de dados: 190
Autores: Aguiar, Ananda Virgínia de; Sousa, Valderês Aparecida de; Shimizu, Jarbas Yukio.
The main deterrent to the adoption of new species for operational plantations is the availability of  genetically improved seeds in sufficient amount to supply the  market. Therefore, this study was carried out with the objective to estimate genetic parameters for individual selection as a basis to transform the field trial into a seedling seed orchard. The trial contained forty seven half-sib families from five Mexican provenances, including northern and central Mexico sources. These were planted at Ponta Grossa, Paraná State, Brazil, in arandomized complete block design with nine  replications of five-tree linear plots in a 3 m x 3 m spacing. Height, dbh (diameter at breast height) and stem form were assessed in thirteen-year old tree. Variance...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeding; Heritability; Expected progress. Melhoramento genético; Herdabilidade; Progresso esperado.
Ano: 2010
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/94

Genetic parameters for germination characters in twenty promising progenies of a çaizeiro for palm heart production
Provedor de dados: 190
Autores: Oliveira, Maria do Socorro Padilha de; Farias Neto, João Tomé de; Nascimento, Walnice Maria Oliveira do.
Germination of half-sib progenies of Euterpe oleracea Mart., promising for palm heart production were studied. A cluster with seeds of each progenie was selected at Embrapa Experimental Sation placed in Eastern Amazonia. Fruits were immersed in warm water and the chosen seeds were sown immediately. Randomized blocks design with 25 treatments (progenies), three repetitions and parcels of 100 seeds were utilized. Evaluation of the following characters were made: days for beginning (IG) and end (FG), average time (TM) and percentage (PG) of germination. Progenies presented genetic differences for germination characters. Beginning of germination (IG) and the average time (TM) showed the biggest estimates of heritability related to b index.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heritability; Genetic variation; Euterpe oleracea; Breeding Herdabilidade; Variação genética; Euterpe oleracea; Melhoramento.
Ano: 2003
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1623

Avaliação de progênies de macaúba na fase juvenil e estimativas de parâmetros genéticos e diversidade genética
Provedor de dados: 190
Autores: Manfio, Candida Elisa; Motoike, Sérgio Yoshimitsu; Resende, Marcos Deon Vilela de; Santos, Carlos Eduardo Magalhães dos; Sato, Aurora Yoshiko.
A macaúba (Acrocomia aculeata) é uma palmeira oleaginosa e o extrativismo de seus frutos é de grande importância socioeconômica para os pequenos produtores rurais. O objetivo deste trabalho foi avaliar a variabilidade genética e obter informações sobre o controle genético de características morfológicas relacionadas ao crescimento e vigor da macaúba. Foram coletadas 51 progênies em Minas Gerais e São Paulo, as quais são integrantes do banco ativo de germoplasma da Universidade Federal de Viçosa. Doze meses após o plantio, essas progênies foram avaliadas quanto ao crescimento da planta (cm) e número de folhas emitidas. Estas características apresentaram grande variabilidade entre as progênies. As estimativas dos coeficientes de herdabilidade foram de 87% e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acrocomia aculeata; Variabilidade genética; Recursos genéticos; Herdabilidade Acroconia aculeata; Genetic variability; Genetic resources; Heritability.
Ano: 2012
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/283

Ecophysiological and Productive Properties as Tool for Breeding of Maté (Ilex paraguariensis St. Hil.)
Provedor de dados: 190
Autores: Rakocevic, Miroslava; Sturion, José Alfredo; Medrado, Moacir José Sales; Lavoranti, Osmir José; Mosele, Sérgio Henrique; Valduga, Alice Tereza.
The aims of this study were to estimate the genetic parameters for 59 half-sib progenies of maté under runing for formation, and to evaluate the ecophysiological properties for four progenies (P15, P18, P41 e  47) and two controls (P61 and P62), components of one maté breeding experiment combining  rovenances and progenies, established in Erechim, RS. The ecophysiological properties (stomatal  onductance (gs) - mol m-2s-1, net photosynthesis (A) - μmol CO2 m-2s-1, and transpiration (E) -mmol H2O  - s-1) were measured during one year in five epochs (from September 2002 to August 2003). The variance  omponents, genetic and phenotypic parameters and genetic values (for data of foliar mass collected in  runing of formation) were obtained using a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic value; Heritability; Photosynthesis; Stomatal conductance; Transpiration. Condutância estomática; Fotossíntese; Herdabilidade; Transpiração; Valor genético.
Ano: 2011
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/229

Genetic evaluation and genetic gains with the selection for Jatropha curcas populations
Provedor de dados: 190
Autores: Juhász, Ana Cristina Pinto; Morais, Danielle de Lourdes Batista; Soares, Bruno Oliveira; Pimenta, Samy; Rabello, Hudson de Oliveira; Resende, Marcos Deon Vilela de.
This work aimed at estimating genetic parameters from the vegetative stage in five populations from Jatropha curcas L. The half sib progenies were cultivated at Biojan farm, in Janaúba, MG. Plant height, stem diameter, number of branches and crown projection were assessed in all plants at three and six months old. In population 2, there was no genetic variability for all traits evaluated. The genetic gains estimated with the selection from the ten best individuals in other populations were 4% to 8% for plant height (population 1 and 4), 5% to 7% for stem diameter (population 1 and 5), 14% to 25% for the number or branches (population 3 and 5) and 9% for crown projections in population 4. According to the results obtained from this study, these populations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Variability; Heritability; Accuracy; Genetic gain. Variabilidade; Herdabilidade; Acurácia; Ganho genético.
Ano: 2010
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/83

Incorporation of compound inflorescences and selection of high-yielding progenies in cowpea
Provedor de dados: 86
Autores: Bernardo,Karla Annielle da Silva; Freire Filho,Francisco Rodrigues; Ribeiro,Valdenir Queiroz; Vieira,Paulo Fernando de Melo Jorge; Lopes,Ângela Celis de Almeida; Oliveira,Rosana Mendes de Moura.
Abstract: The objective of this work was to obtain cowpea (Vigna unguiculata) progenies with compound inflorescences, short peduncles, early cycle, good plant architecture, and high-yielding potential. The initial genetic material consisted of 453 F2:3 progenies, selected from ten crosses and evaluated using Federer’s augmented block design, with two controls. Of these, 60 progenies from the F4:5 and F4:6 generations were selected and assessed in two consecutive experiments, both in a 8x8 lattice design with four controls and four replicates. Early selection was efficient at fixing the evaluated traits. A wide genetic variability was detected among and within progenies. The estimated and obtained heritability and genetic gains in the F4:5 and F4:6...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata; Breeding; Genetic variability; Heritability; Quantitative genetics.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001001150

Estimates of genetic parameters and cluster analyses for carcass and meat quality traits in birds
Provedor de dados: 86
Autores: Bainy,Adriane Molardi; Savegnago,Rodrigo Pelicioni; Freitas,Luara Afonso de; Nunes,Beatriz do Nascimento; Rosa,Jaqueline Oliveira; Ledur,Mônica Corrêa; Munari,Danísio Prado.
Abstract: The objective of this work was to estimate genetic parameters for bird carcass and meat quality traits, as well as to explore the genetic patterns of the breeding values of this population using cluster analyses. Data from 1,846 birds were used to estimate the genetic parameters of production and quality traits using the multiple-trait animal model, and cluster analyses were performed. The heritability estimates ranged from 0.08± 0.03 for meat pH measured 24 hours after slaughter to 0.85± 0.09 for body weight. The genetic correlations between production traits were high and positive. The genetic correlations between meat quality traits were low and were not informative due to the high standard errors (same magnitudes as those of the genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Heritability; Meat color; White Leghorn.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000300205

Biometrical analysis and selection of tetraploid progenies of Panicum maximum using mixed model methods
Provedor de dados: 86
Autores: Resende,Rosangela Maria Simeão; Jank,Liana; Valle,Cacilda Borges do; Bonato,Ana Lídia Variani.
The objectives of this work were to estimate the genetic and phenotypic parameters and to predict the genetic and genotypic values of the selection candidates obtained from intraspecific crosses in Panicum maximum as well as the performance of the hybrid progeny of the existing and projected crosses. Seventy-nine intraspecific hybrids obtained from artificial crosses among five apomictic and three sexual autotetraploid individuals were evaluated in a clonal test with two replications and ten plants per plot. Green matter yield, total and leaf dry matter yields and leaf percentage were evaluated in five cuts per year during three years. Genetic parameters were estimated and breeding and genotypic values were predicted using the restricted maximum...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Guineagrass; Apomixis; Breeding; Heritability; Repeatability; Selection of parents.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000400006

Relationship among phenotypic and quality traits in indigenous and exotic accessions of linseed
Provedor de dados: 86
Autores: Siddiqui,Ameena; Shukla,Sudhir; Rastogi,Anu; Bhargava,Atul; Niranjan,Abhishek; Lehri,Alok.
Abstract: The objective of this work was to evaluate the relationship among phenotypic and quality traits in a set of indigenous and exotic accessions of linseed (Linum usitatissimum). The experimental material consisted of 151 accessions of linseed belonging to landraces and cultivars collected from diverse agroecological zones. Five randomly chosen plants of each accession in each replicate were tagged, and data were recorded for the 12 following agronomic traits: days to flowering, days to maturity, plant weight, plant height, tillers per plant, secondary branches per plant, capsules per plant, seeds per capsule, 1,000 seed weight, harvest index, seed yield per plant, and oil content. Capsules per plant, harvest index, and plant weight played a direct...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Linum usitatissimum; Correlation; Fatty acids; Genetic advance; Heritability; Path analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016001201964

Phenotypic stability and genetic gains in six-year girth growth of Hevea clones
Provedor de dados: 86
Autores: Gonçalves,Paulo de Souza; Fujihara,Alberto Kazutoshi; Ortolani,Altino Aldo; Bataglia,Ondino Cleante; Bortoletto,Nelson; Segnini Junior,Ivo.
Rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Müell. Arg.] budgrafts of seven clones were evaluated on five contrasting sites in the plateau region of the São Paulo State, Brazil. The objective of this work was to study the phenotypic stability for girth growth. The experimental design was a randomized block design with three replications and seven treatments. Analysis of variance of girth at six-year plant growth indicated a highly significant clone x site interaction. Only linear sites and clone x site components of clone x year interaction were significant, indicating that the performance of clones over sites for this trait could be predicted. The clones GT 1 and PB 235 showed the greatest stability in relation to girth growth, with foreseen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rubber tree; Hevea brasiliensis; Heritability; Repeatability.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000700015

Selection strategies of segregant soybean populations for resistance to Asian rust
Provedor de dados: 86
Autores: Ribeiro,Aliny Simony; Toledo,José Francisco Ferraz de; Ramalho,Magno Antonio Patto.
The objective of this work was to identify the best selection strategies for the more promising parental combinations to obtain lines with good resistance to soybean Asian rust (Phakopsora pachyrhizi). Two experiments were carried out in the field during the 2006/2007 and 2007/2008 growing seasons, to determine the percentage of infected leaf area of individual plants of five parents and their segregant F2 and F3 populations. The data obtained indicates that additive genetic variance predominates in the control of soybean resistance to Asian rust, and that the year and time of assessment do not significantly influence the estimates of the genetic parameters obtained. The narrow-sense heritability (h²r) ranged from 23.12 to 55.83%, and indicates the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Phakopsora pachyrhizi; Additive variance; Heritability; Selection.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009001100012

Genetic analysis of productive and reproductive traits in multiple-breed dairy cattle populations
Provedor de dados: 86
Autores: Ribeiro,Virgínia Mara Pereira; Merlo,Fernanda Albuquerque; Gouveia,Gabriela Canabrava; Winkelstroter,Larissa Kretli; Abreu,Luíza Rodrigues Alves; Silva,Marcos Vinícius Gualberto Barbosa da; Panetto,João Cláudio do Carmo; Paiva,Leandro de Carvalho; Cembranelli,Marcello de Aguiar Rodrigues; Toral,Fabio Luiz Buranelo.
Abstract: The objective of this work was to determine whether the random regression model using linear splines (RRMLS) is suitable to estimate the genetic parameters for productive and reproductive traits of a multiple-breed dairy cattle population, as well as to investigate the effect of the genetic group of the progeny on the genetic merit of the sire. The multiple-trait model (MTM) and the RRMLS with one knot fitted for every genetic group were used to obtain the genetic parameters. Records of 1/2 Holstein + 1/2 Gyr (1/2HG), 5/8 Holstein + 3/8 Gyr (5/8HG), and 3/4 Holstein + 1/4 Gyr (3/4HG) crossbreed dams were considered. The RRMLS showed better fitting. The additive and residual variances estimated by the MTM and the RRMLS were similar. Heritability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gyr; Heritability; Heterosis; Holstein; Selection.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001101109

Provenance and family variation of Pinus caribaea var. hondurensis from Guatemala and Honduras, grown in Brazil, Colombia and Venezuela
Provedor de dados: 86
Autores: Moura,Vicente Pongitory Gifoni; Dvorak,William Stephen.
Pinus caribaea var. hondurensis (Sénécl) Barr. &amp;amp; Golf. is a tropical pine that naturally occurs in lowland areas of Belize, El Salvador, Guatemala, Honduras, Nicaragua, and eastern Mexico. It has been one of the most studied tropical pines and the one with the most commercial importance in Brazil. The objective of this work was to select the best provenances for plantations and best trees in families for the establishment of seed orchards. For that a trial with five provenances and 47 open-pollinated families was planted near Planaltina, Federal District, in the Cerrado Region of Brazil. The provenances tested were Poptun (Guatemala), Gualjoco, Los Limones, El Porvenir and Santa Cruz de Yojoa (Honduras) and assessed at 12 years of age. Poptun and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pinus; Selection criteria; Genetic gain; Heritability; Breeding methods.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000200003

Genetic parameters of traits at the juvenile stage of different assai palm tree progenies
Provedor de dados: 86
Autores: Navegantes,Patricia Cardoso Andrade; Oliveira,Maria do Socorro Padilha de; Nunes,José Airton Rodrigues.
Abstract: The objective of this work was to estimate genetic parameters of traits at the juvenile stage of different assai palm (Euterpe oleracea) tree progenies, as well as to select among and within the most promising for fruit production. A total of 34 half-sib and 16 full-sib progenies were evaluated in a completely randomized design with eight replicates and one plant per plot. Nine traits were measured in five harvests, and the data were analyzed using the mixed model approach. The genetic variance was significant for most of the traits. Progeny-mean heritabilities showed moderate magnitudes, ranging from 51% for number of dead leaves to 59% for leaf sheath length. In general, the genetic correlations were positive and had magnitudes varying from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Euterpe oleracea; Full-sib; Genetic correlation; Half-sib; Heritability; Mixed models; Selection gain.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000700815

Estimation of genetic parameters for test-day milk yield in Khuzestan buffalo
Provedor de dados: 86
Autores: Madad,Mostafa; Hossein-Zadeh,Navid Ghavi; Shadparvar,Abdol Ahad.
Abstract: The objective of this work was to estimate covariance functions for additive genetic and permanent environmental effects, as well as to obtain genetic parameters for buffalo test-day milk yield using random regression models on Legendre polynomials (LPs). A total of 2,538 test-day milk yield (TDMY) records from 516 first lactation records of Khuzestan buffalo, calving from 1993 to 2009 and belonging to 150 herds located in the state of Khuzestan, Iran, were analyzed. The residual variances were modeled through a step function with 1, 5, 6, 9, and 19 classes. The additive genetic and permanent environmental random effects were modeled by LPs of days in milk using quadratic to septic polynomial functions. The model with additive genetic and animal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Covariance functions; Genetic correlations; Heritability; Legendre polynomial; Milking buffalo.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000700890

Contemporary groups in the genetic evaluation of Nellore cattle using Bayesian inference
Provedor de dados: 86
Autores: Silva,Delvan Alves da; Silva,Fabyano Fonseca e; Ventura,Henrique Torres; Junqueira,Vinícius Silva; Silva,Alessandra Alves da; Mota,Rodrigo Reis; Lopes,Paulo Sávio.
Abstract: The objective of this work was to evaluate the criteria for the formation of contemporary groups (CGs) in the genetic evaluation of body weight at weaning in Nellore cattle. A total of 713,474 records from 3,066 herds located in Midwestern and Northern Brazil were used. Data were obtained from the genealogical registry of zebu breeds of the Brazilian association of zebu breeders. Data structures were defined based on the number of standard deviations (SDs) for outlier removal (±2.0, ±2.5, ±3.0, and ±3.5) and on the minimal number of animals per CG (3, 7, and 15). Genetic evaluation was performed with an animal model using Bayesian inference. Data structures with ±3.5 SDs and CG with at least 15 animals presented the highest additive genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heritability; Outliers; Zebu.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000800643

Bayesian genetic parameters for body weight and survival of Nile tilapia farmed in Brazil
Provedor de dados: 86
Autores: Santos,Alexandra Inês; Ribeiro,Ricardo Pereira; Vargas,Lauro; Mora,Freddy; Alexandre Filho,Luiz; Fornari,Darci Carlos; Oliveira,Sheila Nogueira de.
The objective of this study was to estimate genetic parameters for survival and weight of Nile tilapia (Oreochromis niloticus), farmed in cages and ponds in Brazil, and to predict genetic gain under different scenarios. Survival was recorded as a binary response (dead or alive), during harvest time in the 2008 grow-out period. Genetic parameters were estimated using a Bayesian mixed linear-threshold animal model via Gibbs sampling. The breeding population consisted of 2,912 individual fish, which were analyzed together with the pedigree of 5,394 fish. The heritabilities estimates, with 95% posterior credible intervals, for tagging weight, harvest weight and survival were 0.17 (0.09-0.27), 0.21 (0.12-0.32) and 0.32 (0.22-0.44), respectively. Credible...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; Correlation; Fish genetic improvement; Gibbs sampling; GIFT strain; Heritability.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000100005

Allohexaploid pearl millet x elephantgrass population potential for a recurrent selection program
Provedor de dados: 86
Autores: Reis,Matheus Costa dos; Sobrinho,Fausto Souza; Ramalho,Magno Antônio Patto; Ferreira,Daniel Furtado; Ledo,Francisco José Silva; Pereira,Antônio Vander.
The objective of this work was to evaluate the potential of allohexaploid pearl millet x elephantgrass (HGL) population for a recurrent selection program through open-pollinated progenies. Seventy-eight progenies, one representative sample of the population, and two commercial cultivars, Pioneiro and Paraíso, were evaluated in a 9x9 triple lattice design, in two sites. Plant height and dry matter yield were evaluated in three and four cuts, respectively. For plant height, the 17 best progenies were similar to both commercial controls, while for dry matter yield they were higher than 'Paraíso' and lower than 'Pioneiro'. The correlation between progenies and cuts indicated that the fourth cut represents the mean of all cuts, and the possibility of using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pennisetum; Heritability; Response to selection; Split-plot lattice design.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000200006

Biometric analysis of protein and oil contents of soybean genotypes in different environments
Provedor de dados: 86
Autores: Rodrigues,Josiane Isabela da Silva; Arruda,Klever Márcio Antunes; Cruz,Cosme Damião; Piovesan,Newton Deniz; Barros,Everaldo Gonçalves de; Moreira,Maurilio Alves.
The objective of this work was to identify by biometric analyses the most stable soybean parents, with higher oil or protein contents, cultivated at different seasons and locations of the state of Minas Gerais, Brazil. Forty-nine genotypes were evaluated in the municipalities of Viçosa, Visconde do Rio Branco, and São Gotardo, in the state of Minas Gerais, from 2009 to 2011. Protein and oil contents were analyzed by infrared spectrometry using a FT-NIR analyzer. The effects of genotype, environment, and genotype x environment interaction were significant. The BARC-8 soybean genotype is the best parent to increase protein contents in the progenies, followed by BR 8014887 and CS 3032PTA276-3-4. Selection for high oil content is more efficient when the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; FT-NIR; Genotype x environment interaction; Heritability.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2014000600475

Estimates of genetic parameters and cluster analysis for worm resistance and resilience in Santa Inês meat sheep
Provedor de dados: 86
Autores: Oliveira,Elisa Junqueira; Savegnago,Rodrigo Pelicioni; Freitas,Luara Afonso de; Freitas,Anielly Paula; Maia,Suellen Rodrigues; Simili,Flávia Fernanda; Faro,Lenira El; Costa,Ricardo Lopes Dias da; Santana Júnior,Mário Luiz; Paz,Claudia Cristina Paro de.
Abstract: The objective of this work was to estimate genetic parameters for traits related to resistance to endoparasites in Santa Inês sheep, for a possible inclusion in sheep breeding programs, as well as to evaluate the additive genetic pattern of the animals using cluster analyzes, in order to assess whether there are groups within the population that can be used as candidates for selection for resistance to endoparasites. The studied traits were: Famacha score, fecal egg counts (FEC), packed cell volume (PCV), total plasma protein (TPP), body condition score (BCS), and body weight (BW). Heritability estimates ranged from 0.17 (0.05) for TPP to 0.31 (0.07) for BCS. The cluster analyzes based on the breeding values identified four clusters. Famacha and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cluster analysis; Famacha; Genetic correlation; Heritability; K-means; Multivariate analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001201338

Simultaneous selection for yield, stability, and adaptability of carioca and black beans
Provedor de dados: 86
Autores: Santos,Paulo Ricardo dos; Costa,Kleyton Danilo da Silva; Nascimento,Maxwel Rodrigues; Lima,Thalyson Vasconcelos; Souza,Yure Pequeno de; Costa,Antonio Félix da; Silva,José Wilson da.
Abstract: The objective of this work was to determine the efficiency of a simultaneous selection for yield, stability, and adaptability of bean genotypes of the carioca and black groups. In the 2016 harvest, two experiments were carried out in the state of Pernambuco, Brazil: one for the carioca group, with 20 genotypes, in the municipalities of Caruaru, Arcoverde, and Belém de São Francisco; and the other for the black group, with 12 genotypes, in the municipalities of Caruaru and Arcoverde. The parameters were estimated by mixed models, and selection was performed by the harmonic mean of the relative performance of genetic values, using three strategies: selection based on the predicted genetic value, without interaction; selection based on the predicted...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Genotype x environment interaction; Heritability; Mixed models; REML/Blup.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000600736

Designs and model effects definitions in the initial stage of a plant breeding program
Provedor de dados: 86
Autores: Souza,Emanuel Fernando Maia de; Peternelli,Luiz Alexandre; Barbosa,Márcio Henrique Pereira.
The objective of this work was to compare the relative efficiency of initial selection and genetic parameter estimation, using augmented blocks design (ABD), augmented blocks twice replicated design (DABD) and group of randomised block design experiments with common treatments (ERBCT), by simulations, considering fixed effect model and mixed model with regular treatment effects as random. For the simulations, eight different conditions (scenarios) were considered. From the 600 simulations in each scenario, the mean percentage selection coincidence, the Pearsons´s correlation estimates between adjusted means for the fixed effects model, and the heritability estimates for the mixed model were evaluated. DABD and ERBCT were very similar in their comparisons...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Augmented design; Incomplete block; Selection; Heritability; Sugarcane; Stochastic simulation.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000300001

Single-trait bayesian analysis of some growth traits in japanese quail
Provedor de dados: 89
Autores: Karaman,E; Firat,MZ; Narinc,D.
The aim of this study was to estimate the heritability for some growth traits of Japanese quail through the estimation of variance components by Bayesian methodology. For this purpose, 340 progenies of 34 sires were used. Live weight (LW42) and absolute and relative growth rates at 42 days of age (AGR42 and RGR42, respectively) were submitted to single-trait analysis under a sire model. A software (package MCMCglmm) was used for the estimations, and a single chain with 65,000 rounds was run for each trait with a thinning interval of 50. Burn-in was set at 15,000 and inferences were built on posterior samples of 1,000 draws for each trait. All marginal posterior densities were unimodal and marginal posterior distributions of sire variance are slightly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Absolute growth rate; Bayesian; Heritability; Quail; Relative growth rate.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2014000200007

Morphological genetic markers for selection of broiler lines
Provedor de dados: 89
Autores: Schmidt,GS; Coutinho,LL; Figueiredo,EAP de; Ledur,MC; Alves,HJ.
Two paternal broiler lines (LL and LLc, originated from the same stock in 1998) of Embrapa Suinos e Aves genetic program were used. Line LL had been selected for eight generations for rapid growth while LLc had been mated randomly, without selection, as a control line. In the last generation, 30 males and 240 females were used in hierarchical matings with pedigree control to determine sire effect. The same number of birds were used, but matings were at random for LLc. Eggs of both lines were incubated and embryos were collected in different development stages (40, 45, 50, 55 and 60 hours after setting) in order to determine somite number (NOS). The number of evaluated embryos were 1,967 and 498 for LL and LLc, respectively. This study aimed to determine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic; Heritability; Selection; Somite.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2003000300003

Variance components for body weight in Japanese quails (Coturnix japonica)
Provedor de dados: 89
Autores: Resende,RO; Martins,EN; Georg,PC; Paiva,E; Conti,ACM; Santos,AI; Sakaguti,ES; Murakami,AE.
The objective of this study was to estimate the variance components for body weight in Japanese quails by Bayesian procedures. The body weight at hatch (BWH) and at 7 (BW07), 14 (BW14), 21 (BW21) and 28 days of age (BW28) of 3,520 quails was recorded from August 2001 to June 2002. A multiple-trait animal model with additive genetic, maternal environment and residual effects was implemented by Gibbs sampling methodology. A single Gibbs sampling with 80,000 rounds was generated by the program MTGSAM (Multiple Trait Gibbs Sampling in Animal Model). Normal and inverted Wishart distributions were used as prior distributions for the random effects and the variance components, respectively. Variance components were estimated based on the 500 samples that were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian inference; Heritability; Maternal environment.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2005000100004

Estimates of genetic parameters for fruit yield and quality in custard apple progenies
Provedor de dados: 94
Autores: Silva,Paulo Sérgio Lima e; Antonio,Rafaela Priscila; Mariguele,Keny Henrique; Silva,Kathia Maria Barbosa e; Lima,Lidiane Kely de; Silva,Júlio César do Vale.
Apparently, there are no custard apple cultivars defined for the northeastern region of Brazil. The establishment of breeding programs aimed at the selection of types from productive locations for later cloning is desirable. This work's objective was to evaluate the yield (during the first three crops) and quality (first crop) of fruits from 20 half-sibling custard apple tree progenies, selected from home orchards. An additional objective was to estimate genetic parameters for the traits evaluated. A micro sprinkling-irrigated experiment was conducted in Mossoró-RN, Brazil, as random blocks with five replications. In characteristics evaluated for periods longer than a year (diameter, height and mean weight of fruits, number of fruits ha-1 and fruit yield...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annona squamosa L.; Bullock's heart; Sweetsop; Heritability; Genotypic correlation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452007000300027

Estimation of (co)variance components and genetic parameters for weights of red-winged tinamou using random regression models
Provedor de dados: 96
Autores: Tholon,P.; Queiroz,S.A.
The objective of this work was to determine genetic parameters for body weight of tinamou in captivity. It was used random regression models in analyses of data by considering the direct additive genetic (DA) and permanent environmental effects of the animal (PE) as random effects. Residual variances were modeled by using a fifth-order variance function. The mean population growth curve was fitted by sixth-order Legendre orthogonal polynomials. Direct additive genetic effects and animal environmental permanent effect were modeled by using Legendre polynomials of order two to nine. The best results were obtained by models with orders of fit of 6 for direct additive genetic effect and of order 3 for permanent effect by Akaike information criterion and of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Heritability; Legendre polynomials; Tinamou; Wild bird.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000400011

Estimates of genetic parameters for visual scores and their correlation with production and reproductive traits in Brahman cattle
Provedor de dados: 96
Autores: Bertipaglia,Tássia Souza; Carreño,Luis Orlando Duitama; Machado,Carlos Henrique Cavallini; Andrighetto,Cristiana; Fonseca,Ricardo da.
The objective of this study was to evaluate the association of visual scores of body structure, precocity and muscularity with production (body weight at 18 months and average daily gain) and reproductive (scrotal circumference) traits in Brahman cattle in order to determine the possible use of these scores as selection criteria to improve carcass quality. Covariance components were estimated by the restricted maximum likelihood method using an animal model that included contemporary group as fixed effect. A total of 1,116 observations of body structure, precocity and muscularity were used. Heritability was 0.39, 043 and 0.40 for body structure, precocity and muscularity, respectively. The genetic correlations were 0.79 between body structure and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Average daily gain; Body weight at 18 months; Genetic correlation; Heritability; Scrotal circumference.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000600013

Genetic parameters for milk yield, lactation length and calving intervals of Murrah buffaloes from Brazil
Provedor de dados: 96
Autores: Malhado,Carlos Henrique Mendes; Malhado,Ana Claudia Mendes; Ramos,Alcides de Amorim; Carneiro,Paulo Luiz Souza; Souza,Julio César de; Pala,Akin.
The major objective of this study was to estimate heritability and genetic correlations between milk yield (MY) and calving interval (CI) and lactation length (LL) in Murrah buffaloes using Bayesian inference. The database used belongs to the genetic improvement program of four buffalo herds from Brazil. To obtain the estimates of variance and covariance, bivariate analyses were performed with the Gibbs sampler, using the program MTGSAM. The heritability coefficient estimates were 0.28, 0.03 and 0.15 for MY, CI and LL, respectively. The genetic correlations between MY and LL was moderate (0.48). However, the genetic correlation between MY and CI showed large HPD regions (highest posterior density interval). Milk yield was the only trait with clear...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Gibbs sampler; Heritability.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000800005

Selection objectives and criteria for sheep in Central Brazil
Provedor de dados: 96
Autores: McManus,Concepta; Pinto,Bruno Freitas; Martins,Rafhael Felipe Saraiva; Louvandini,Helder; Paiva,Samuel Rezende; Braccini Neto,José; Paim,Tiago do Prado.
Three production systems for sheep (Low - L, Medium - M and High - H technology), with increasing technological levels, were studied under conditions in the Center-west of Brazil, to determine economic weights and selection indices of important traits. Receipts and costs were simulated using an economic simulator to calculate the structure of the operational costs. Only characteristics that were responsible for more than 10% of the profit were studied, which included: number of weaned lambs, food consumption (ewe and lamb), weight of carcass and weight of female lambs sold for reproduction. Regardless of the index used (profitability or yield) or system (L, M or H), the economic weights are larger for the number of lambs weaned per ewe. With improvement in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Correlations; Costs; Heritability; Profit; Revenue.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001200014

Genetic evaluation of partial growth trajectory of Santa Inês breed using random regression models
Provedor de dados: 96
Autores: Oliveira,Kassiana Adriano Pinto de; Lôbo,Raimundo Nonato Braga; Facó,Olivardo.
It was evaluated data set of 19,303 weight records of Santa Inês sheep in order to evaluate distinct polynomial functions with different order for better adjustements of fixed and random regressions of growth trajectory and to estimate (co)variances components and genetic parameters of this trajectory. Fixed effects used in analysis were contemporary group, sex and birth type. Ordinary and Legendre polynomials, ranging from two to four orders, were evaluated for fixed regression of average growth trajectory. Legendre and quadratic b-spline functions, ranging from three to four orders, were evaluated for random regressions. Legendre polynomials of order fourth were suitable to fit random regression, while ordinary polynomials of third order were the best...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Β-spline functions; Genetic correlation; Heritability; Legendre polynomials; Ordinary polynomials.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000500013

Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers
Provedor de dados: 96
Autores: Claus,Luís Afonso Marques; Koetz Júnior,Celso; Roso,Vanerlei Mozaquatro; Borges,Marcelo Henrique Favaro; Barcellos,Júlio Otávio Jardim; Ribeiro,Edson Luis de Azambuja.
ABSTRACT This study aimed at estimating the heritability of age at first calving and of performance traits included in the selection index and the genetic correlations between age at first calving and these performance traits. Data were extracted from the Conexão Delta G database and only data from herds in which heifers were bred younger than 24 months of age were used, resulting in a file with 331,310 evaluated animals. The following traits were included in the analyses: age at first calving, birth to weaning gain, post-weaning weight gain, visual scores of conformation, precocity, and muscling evaluated at weaning and in yearling heifers. Covariance components were obtained by bi-character analyses between traits. An alternative age at first calving was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Breeding; Heritability.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000400303

Genetic parameters for milk traits, somatic cell, and total bacteria count scores in Brazilian Jersey herds
Provedor de dados: 96
Autores: Sabedot,Mayara Andressa; Romano,Gabrieli de Souza; Pedrosa,Victor Breno; Pinto,Luís Fernando Batista.
ABSTRACT This study aimed to estimate the heritability of milk yield (MY), fat percent (F%), fat yield (FY), protein percent (P%), protein yield (PY), somatic cell score (SCS), and total bacterial count score (TBCS) as well as to estimate the genetic correlations among these traits, using a dataset from 5,918 lactations of Jersey cows in Brazil. The covariance components were estimated by restricted maximum likelihood using the PEST and VCE6 programs. The average values obtained for MY, F%, FY, P%, PY, SCS, and TBCS were 5017.5 kg, 4.3%, 192.3 kg, 3.3%, 173.0 kg, 5.9, and 2.9, respectively, while the heritability values were 0.16, 0.55, 0.18, 0.61, 0.25, 0.21, and 0.08, respectively. The genetic correlations ranged from low to high magnitude, with positive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Heritability; Mastitis resistance; Selection.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100408

Persistence in milk, fat and protein production of primiparous Holstein cows by random regression models
Provedor de dados: 96
Autores: Biassus,Igor de Oliveira; Cobuci,Jaime Araújo; Costa,Claudio Napolis; Rorato,Paulo Roberto Nogara; Braccini Neto,José; Cardoso,Leandro Lunardini.
Total numbers of 56,508, 35,091 and 8,326 records of milk, fat, and protein test-day yields, respectively, were used to estimate genetic parameters for six persistency measures on milk, fat and protein productions of Holstein cows reared in Minas Gerais state. Covariance components for additive genetic effects and permanent environmental effects were estimated by REML in random regression models using Legendre polynomials from the third to the sixth order. Overall, models with the highest orders of Legendre polynomials showed the best quality of adjustments of these productive records. Heritability estimates obtained by the models for persistence in milk, fat, and protein yields ranged from 0.04 to 0.32, from 0.00 to 0.23, and from 0.00 to 0.27,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Heritability; Legendre polynomials; Random regression model; Selection.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001200009

Random regression models with B-splines to estimate genetic parameters for body weight of young bulls in performance tests
Provedor de dados: 96
Autores: Scalez,Daiane Cristina Becker; Fragomeni,Breno de Oliveira; Santos,Dalinne Chrystian Carvalho dos; Passafaro,Tiago Luciano; Alencar,Maurício Mello de; Toral,Fabio Luiz Buranelo.
ABSTRACT The objective of this study was to estimate genetic parameters for body weight of beef cattle in performance tests. Different random regression models with quadratic B-splines and heterogeneous residual variance were fitted to estimate covariance functions for body weights of Nellore and crossbred Charolais × Nellore bulls. The criteria −2 residual log-likelihood (−2RLL), Akaike Information Criterion (AIC), and consistent AIC (CAIC) were used to choose the most appropriate model. For Nellore bulls, residual variance was modeled with six classes of age, and direct additive genetic and permanent environment effects were modeled with quadratic B-splines with two and one intervals, respectively. For crossbred bulls, quadratic B-splines with one...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal breeding; Bos indicus; Genetic correlation; Heritability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100407

Estimates of covariance components for hygienic behavior in Africanized honeybees (Apis mellifera)
Provedor de dados: 96
Autores: Costa-Maia,Fabiana Martins; Toledo,Vagner de Alencar Arnaut de; Martins,Elias Nunes; Lino-Lourenço,Daniela Andressa; Sereia,Maria Josiane; Oliveira,Carlos Antonio Lopes de; Faquinello,Patrícia; Halak,André Luiz.
Genetic and phenotypic parameters considering the genetic effect on hygienic behavior of queen and workers from 40 Africanized honeybees colonies were estimated separately. Maternal origin of queens was controlled whereas the paternal was unknown, and different groups of workers were considered in three seasons, October 2006, April 2007 and August 2007, but with the same queen. Colonies were 21 honey producers and 19 royal jelly producers. After the method of freezing capped brood, hygienic behavior was determined by the ratio between the number of dead capped brood removed at 24, 48 and 72 hours and the total number of capped brood at zero hour. Data was submitted to single and three traits analyses using Bayesian inference. Estimates of direct...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Africanized honeybee queens; Bayesian inference; Genetic correlation; Heritability; Maternal effect; Removal of dead capped brood.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000900010

Genetic parameters and relationships between heifers rebreeding and hip height in Nellore cattle
Provedor de dados: 96
Autores: Boligon,Arione Augusti; Albuquerque,Lucia Galvão de.
The objective of this study was to estimate heritability and verify the genetic correlations between heifers subsequent rebreeding with weaning hip height (WHH) and yearling hip height (YHH), using Bayesian inference. The (co)variance components and genetic parameters were estimated using an animal nonlinear (threshold) model for subsequent rebreeding and an animal linear model for WHH and YHH. The animal model included the contemporary group as the systematic effect and direct additive genetic and residual effects as random effects. Genetic maternal and maternal permanent environment effects were also considered in the model for WHH. Covariables considered were: rest period (linear effect), for subsequent rebreeding; animal age at measurement and age of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian inference; Beef cattle; Heritability; Reproductive trait.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000300017

Study of relations among age at first calving, average weight gains and weights from weaning to maturity in Nellore cattle
Provedor de dados: 96
Autores: Boligon,Arione Augusti; Albuquerque,Lucia Galvão de; Mercadante,Maria Eugênia Zerlotti; Lôbo,Raysildo Barbosa.
Data from 23,120 Nellore animals were used to estimate genetic parameters for age at first calving, average gains from weaning to yearling and from yearling to after yearling, weaning weight, yearling weight, after yearling weight and weight at 2 and 5 years of age. Animal models were fitted by Restricted Maximum likelihood Method. Estimate heritability for age at first calving, weaning to yearling weight gain, yearling to after yearling weight gain, weight at weaning, yearling weight, after yearling weight and weight from 2 to 5 years of age were 0.17 ± 0.01; 0.23 ± 0.03; 0.25 ± 0.03; 0.28 ± 0.02; 0.26 ± 0.03; 0.30 ± 0.03; 0.32 ± 0.02 and 0.36 ± 0.04, respectively. The genetic correlation estimates between age at first calving and weight traits ranged...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Genetic parameters; Heritability; Productive; Reproductive traits.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400007

Genetic parameters for type score traits and milk production in Brazilian Jersey herds
Provedor de dados: 96
Autores: Sabedot,Mayara Andressa; Romano,Gabrieli de Souza; Pedrosa,Victor Breno; Pinto,Luís Fernando Batista.
ABSTRACT This study aimed to estimate the heritability coefficients for ten functional type traits and milk production in the Jersey breed in Brazil, besides the genetic and phenotypic correlations between them. The present study utilised data from 1,567 records of linear type traits, including stature (ST), body depth (BD), loin strength (LS), rump width (RW), rump angle (RA), fore udder attachment (FUA), front teat placement (FTP), rear udder height (RUH), central ligament (CL), and final score (FS). Milk yield (MY) adjusted to 305 lactation days was also calculated. Covariance components were estimated by the restricted maximum likelihood approach using the PEST and VCE6 programs on the animal model. Heritability coefficients thus assessed were as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy cattle; Genetic correlation; Heritability; Selection.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100409

Modeling of average growth curve in Santa Ines sheep using random regression models
Provedor de dados: 96
Autores: Sarmento,José Lindenberg Rocha; Torres,Robledo de Almeida; Sousa,Wandrick Hauss de; Albuquerque,Lucia Galvão de; Lôbo,Raimundo Nonato Braga; Sousa,José Ernandes Rufino de.
Polynomial functions of age of different orders were evaluated in the modeling of the average growth trajectory in Santa Ines sheep in random regression models. Initially, the analyses were performed not considering the animal effect. Subsequently, the random regression analyses were performed including the random effects of the animal and its mother (genetic and permanent environment). The linear fit was lower, and the other orders were similar until near 100 days of age. The cubic function provided the closest fit of the observed averages, mainly at the end of the curve. Orders superior to this one tended to present incoherent behavior with the observed weights. The estimated direct heritabilities, considering the linear fit, were higher to those...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal model; Breeding values; Fixed regression; Hairless sheep; Heritability; Polynomial functions.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000200012

Associations among growth, scrotal circumference, and visual score of beef cattle in performance tests on pasture or in feedlots
Provedor de dados: 96
Autores: Raidan,Fernanda Santos Silva; Tineo,Juan Salvador Andrade; Moraes,Mariana Mamedes de; Escarce,Thiago Campos; Araújo,Andresa Eva Melo de; Gomes,Muller Marques de Carvalho; Ventura,Henrique Torres; Toral,Fabio Luiz Buranelo.
ABSTRACT This study aimed to evaluate associations among final weight (FW), average daily gain (ADG), scrotal circumference (SC), and visual score (VS) of beef cattle in performance tests on pasture or in feedlots. Genetic parameters for FW, ADG, SC, and VS of young Nellore bulls performance-tested on pasture or in feedlots were evaluated by mixed model. The performance test and final age were considered as fixed effects and additive genetic and residual effects were considered as random effects. Additive genetic and residual variances for final weight and average daily gain were smaller on pasture than in feedlots. There was no difference between genetic and residual variances and heritability for scrotal circumference on pasture or in feedlots. Genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bos indicus; Genetic correlation; Heritability; Phenotypic selection.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000400309

Genetic characterization of egg weight, egg production and age at first egg in quails
Provedor de dados: 96
Autores: Hidalgo,André Marubayashi; Martins,Elias Nunes; Santos,Alexandre Leseur dos; Quadros,Thays Cristina Oliveira de; Ton,Ana Paula Silva; Teixeira,Rafael.
The objective of this research was to estimate genetic parameters for the traits egg weight, egg production in 189 days and age at first egg in three laying quails and one meat line of quails. Data was analyzed by Bayesian procedures using Gibbs sampling. The heritability estimates for egg weight, egg production in 189 days and age at first egg, were, respectively, for yellow line, 0.31, 0.84 and 0.53; for blue line, 0.14, 0.82 and 0.60; for red line, 0.70, 0.96 and 0.75; and for meat line, 0.73, 0.96 and 0.72. Genetic correlation between egg weight and egg production in 189 days, egg weight and day at first egg and egg production in 189 days and day at first egg were for yellow line, 0.58, -0.77 and -0.90; for blue line, 0.09, -0.01 and -0.95; for red...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Genetic variance; Heritability; Overlap probability; Quails.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000100013

Genetic and environmental variance and covariance parameters for some reproductive traits of Holstein and Jersey cattle in Antioquia (Colombia)
Provedor de dados: 96
Autores: Zambrano,Juan Carlos; Echeverri,Julián.
The objective of this study was to estimate the genetic, phenotypic and environmental parameters for calving interval (CI), days open (DO), number of services per conception (NSC) and conception rate (CR) in Holstein and Jersey cattle in Antioquia (Colombia). Variance and covariance component estimates were obtained by an animal model that was solved using the derivative-free restricted maximum likelihood method. The means and standard deviations for CI, DO, NSC and CR were: 430.32±77.93 days, 127.15±76.96 days, 1.58±1.03 services per conception and 79.88±28.66% in Holstein cattle, and 409.33±86.48 days, 125.62±86.09 days, 1.48±0.98 services per conception and 84.08±27.23% in Jersey cattle, respectively. The heritability estimates (standard errors) were:...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertility; Genetic correlation; Heritability; Repeatability.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000300005

Genetic parameters, genetic trends, and principal component analysis for productive and reproductive traits of Guzera beef cattle
Provedor de dados: 96
Autores: Tramonte,Nicole Colucci; Grupioni,Natalia Vinhal; Stafuzza,Nedenia Bonvino; Guidolin,Diego Gomes Freire; Savegnago,Rodrigo Pelicioni; Bezerra,Luiz Antonio Framartino; Lôbo,Raysildo Barbosa; Munari,Danísio Prado.
ABSTRACT The objectives of this study were to estimate genetic parameters and genetic trends and perform principal component analysis for the following traits: body weight adjusted at 210 days of age (W210), one year (W365), and yearling or 450 days of age (W450); weight gain from birth to weaning or 210 days of age (WGBW), from weaning to 365 days of age (WGW365), and from one year to yearling (WGY); and scrotal circumference adjusted at 365 (SC365) and 450 (SC450) days of age of Guzera beef cattle. Variance components were estimated under a two-trait animal model using the restricted maximum likelihood method. The fixed effects included in the model were birth season, contemporary group, and covariable age of dam at calving as linear and quadratic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal breeding; Bos taurus indicus; Genetic correlation; Heritability.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100308

Genetic parameters for test day milk yield of first lactation Holstein cows estimated by random regression using Legendre polynomials
Provedor de dados: 96
Autores: Costa,Claudio Napolis; Melo,Claudio Manoel Rodrigues de; Packer,Irineu Umberto; Freitas,Ary Ferreira de; Teixeira,Nilson Milagres; Cobuci,Jaime Araujo.
Data comprising 263,390 test-day (TD) records of 32,448 first parity cows calving in 467 herds between 1991 and 2001 from the Brazilian Holstein Association were used to estimate genetic and permanent environmental variance components in a random regression animal model using Legendre polynomials (LP) of order three to five by REML. Residual variance was assumed to be constant in all or in some classes of lactation periods for each LP. Estimates of genetic and permanent environmental variances did not show any trend due to the increase in the LP order. Residual variance decreased as the order of LP increased when it was assumed constant, and it was highest at the beginning of lactation and relatively constant in mid lactation when assumed to vary between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Covariance components; Dairy cattle; Genetic evaluation; Heritability; Selection.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982008000400003

Genetic parameters for type traits in Holstein cows in Brazil
Provedor de dados: 96
Autores: Campos,Rafael Viegas; Cobuci,Jaime Araujo; Costa,Claudio Napolis; Braccini Neto,José.
Data from 26,558 Holstein cows in 802 herds were used to estimate genetic, residual and phenotypic parameters for 22 type traits. The model included the fixed effects of herd-year, period of classification, classifier, stage of lactation and age of cows at calving (covariate) and random genetic and residual effects. Heritability for type traits ranged from 0.10 to 0.39. The genetic variability in these traits suggested the possibility for moderate genetic gains through selection. The phenotypic correlations were moderated, mainly in the section conformation. Genetic correlations between type traits ranged from -0.44 to 0.85. High genetic correlations indicated that breeding programs could be successful without including all type traits. The selection for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: (co)variance components; Dairy cattle; Genetic correlations; Heritability; REMLF90; Selection.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001000003

Genetic evaluation for egg mass in partial periods and complete period in meat quails
Provedor de dados: 96
Autores: Ribeiro,Jeferson Corrêa; Silva,Luciano Pinheiro da; Sousa,Mariele Freitas; Leite,Carla Daniela Suguimoto; Bonafé,Cristina Moreira; Caetano,Giovani da Costa; Crispim,Aline Camporez; Torres,Robledo de Almeida.
The objective of this study was to obtain estimates of genetic and phenotypic parameters for egg mass of meat quails and also to propose an optimal age for selection of birds through the egg mass. The data used in this study came from 3,503 female meat quails (UFV1: 1.811 quails; UFV2: 1.692 quails) of the Poultry Breeding Program from Universidade Federal de Viçosa. The traits examined were egg mass in partial periods until 77, 112, 147 and 182 days, and egg mass in the total period of 407 days by the use of single and bi-trait animal models. For the genetic group UFV1, the heritability values for the periods were high: 0.58, 0.59, 0.57, 0.59 and 0.24 (until 77, 112, 147,182 and 407 days, respectively). The values of genetic correlations were medium,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal model; Coturnix coturnix; Egg weight; Genetic correlation; Heritability; Relative efficiency.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000500012

Genetic parameters and alternatives for evaluation and ranking of Nellore young bulls in pasture performance tests
Provedor de dados: 96
Autores: Fragomeni,Breno de Oliveira; Scalez,Daiane Cristina Becker; Toral,Fábio Luiz Buranelo; Bergmann,José Aurélio Garcia; Pereira,Idalmo Garcia; Costa,Paula Souza Teixeira da.
The objective of this study was to estimate (co)variance components for weight at 550 days, average daily gain and an index with both traits, and to compare alternatives for evaluation and ranking of Nellore young bulls in pasture performance tests. The heritability estimates were 0.73, 0.31 and 0.44 for weight at 550 days, average daily gain and index, respectively. Animals were ranked according to their predicted breeding values or the phenotypic deviations in relation to the mean of the test. Although the correlations between breeding values and phenotypic deviations were high, there were differences in the number of animals selected in common when the selection criteria were the predicted breeding values or the phenotypic deviations. Mixed models are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Breeding value; Heritability; Least square; Mixed models; Selection.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000800004

Estimation of variance components, genetic parameters and genetic trends for litter size of swines
Provedor de dados: 96
Autores: Barbosa,Leandro; Lopes,Paulo Sávio; Regazzi,Adair José; Torres,Robledo de Almeida; Santana Júnior,Mário Luiz; Veroneze,Renata.
Records of Large White breed animals were used to estimate variance components, genetic parameters and trends for the character total number of born piglets (TNBP) as measure of litter size. For obtaining variance components and genetic parameters, it was used the Restricted Maximum Likelihood Method using MTDFREML software. Two mixed models (additive and repeatability) were evaluated. The additive model contained fixed effect of the contemporary group and the following random effects: direct additive genetic and residual effect for the first parturition. Repeatability model had the same effects of the additive model plus parturition order fixed effect and non-correlated animal permanent environment random effect for the second, third and forth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic trend; Heritability; Number of piglets; REML; Repeatability model; Reproductive traits.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001000008

Inbreeding on productive and reproductive traits of dairy Gyr cattle
Provedor de dados: 96
Autores: Reis Filho,João Cruz; Verneque,Rui da Silva; Torres,Robledo de Almeida; Lopes,Paulo Sávio; Raidan,Fernanda Santos Silva; Toral,Fabio Luiz Buranelo.
The objective of this study was to estimate genetic parameters and to evaluate the effects of inbreeding on productive and reproductive traits of dairy Gyr cattle. Single-trait animal models were used to estimate genetic parameters and solutions for inbreeding coefficients for milk (milk 305-d), fat (fat 305-d), protein (protein 305-d), lactose (lactose 305-d), and total solids (TS 305-d) yield up to 305 days of lactation, days in milk (DIM), age at first calving (AFC) and calving intervals (CI). The mean inbreeding coefficient was 2.82%. The models with linear and quadratic effects of inbreeding coefficients fitted the data better than the models without or with only linear effect of inbreeding coefficient for all traits. The increase in inbreeding...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy cattle; Genetic parameter; Heritability; Inbreeding depression.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000500174

Genetic parameters for milk production by using random regression models with different alternatives of fixed regression modeling
Provedor de dados: 96
Autores: Cobuci,Jaime Araújo; Costa,Claudio Napolis; Braccini Neto,José; Freitas,Ary Ferreira de.
Records of test-day milk yields of the first three lactations of 25,500 Holstein cows were used to estimate genetic parameters for milk yield by using two alternatives of definition of fixed regression of the random regression models (RRM). Legendre polynomials of fourth and fifth orders were used to model regression of fixed curve (defined based on averages of the populations or multiple sub-populations formed by grouping animals which calved at the same age and in the same season of the year) or random lactation curves (additive genetic and permanent enviroment). Akaike information criterion (AIC) and Bayesian information criterion (BIC) indicated that the models which used multiple regression of fixed lactation curves of lactation multiple regression...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Test-day milk yield; Genetic correlation; Heritability; Legendre polynomial; Selection.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000300013

The role of quantitative genetic studies in animal physiological ecology
Provedor de dados: 97
Autores: Artacho,Paulina; Castañeda,Luis E.; Nespolo,Roberto F.
Evolutionary physiology is a new discipline with roots in comparative physiology. One major change in the emergence of this discipline was an explicit new focus on viewing organisms as the evolutionary products of natural selection. The shift in research emphasis from comparative physiology to evolutionary physiology has resulted in physiological traits becoming important elements in broad research programs of evolution and ecology. Evolutionary quantitative genetics is a theory-based biological discipline that has developed the quantitative tools to test explicit evolutionary hypotheses. The role of quantitative genetics has been paramount, in studying the microevolution of morphology, behavior and life history, but not comparative physiology. As a...
Tipo: Journal article
Palavras-chave: Evolutionary physiology; Heritability; Directional selection differential; Response to selection; Fitness.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000100012

Determination of the genetic variation in Ajowan (Carum Copticum L.) populations using multivariate statistical techniques
Provedor de dados: 124
Autores: Dalkani,Mahdieh; Hassani,Abbas; Darvishzadeh,Reza.
The experiment was conducted at Urmia University, to assess genetic diversity in populations of Iranian Ajwain based on agronomical and morphological characteristics. Ten populations, collected from different regions, were evaluated in a completely randomised design with eight to ten replications. Various agronomical and morphological characteristics were measured, including stem diameter, plant height, number of branches, number of leaves and leaflets, number of umbels, number of umbellules per inflorescence, number of flowers per umbellule with inflorescence, leaf length, average internodal distance, shoot dry matter, one hundred seed weight, number of seeds, biological production, single plant yield, length of ripening period and harvest index. Among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ajwain; Genetic diversity; Heritability.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902012000400011

Estimation of genetic parameters for weight traits and Kleiber Index in a Brahman cattle population
Provedor de dados: 63
Autores: Manuel,Matos; Cavani,Ligia; Millen,Danilo Domingues; Andrighetto,Cristiana; Lupatini,Gelci Carlos; Fonseca,Ricardo da.
ABSTRACT: Interest in improving feed efficiency of cattle has been increasing. The residual feed intake (RFI), the most commonly used measurement of feed efficiency, is expensive and can only be used in a small number of animals. The Kleiber Index has also been proposed to measure RFI. In this study, we estimated genetic parameters for the Kleiber Index average daily weight gain and adjusted weights to obtain a more comprehensive understanding of potential responses to selection and support the development of breeding strategies. Genetic analyses were conducted on animal records from a data file with 36,505 animals recorded by ABCZ (Brazilian Association of Zebu Breeders). Restricted maximum likelihood estimates of genetic parameters were computed with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Average daily gain; Heritability; Standard age weight.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001600459

Inheritance of pinacle exsertion in rice
Provedor de dados: 63
Autores: Cruz,Renata Pereira da; Milach,Sandra Cristina Kothe; Federizzi,Luiz Carlos.
Incomplete panicle exsertion is one of the symptoms of cold injury at the reproductive stage of the rice plant (Oryza sativa L.), which damages grain yield and raises disease incidence. For this reason, panicle exsertion is a better indicator of cold tolerance under field conditions than spikelet sterility, which may also be affected by other climatic factors. This work studies the variability of degree of panicle exsertion in rice, under the Southern Brazilian environmental conditions and determines the inheritance and heritability of this trait. Four rice genotypes of different cool temperature reactions at the reproductive stage were crossed and field evaluated, with the F2 generation, in relation to the degree of panicle exsertion and spikelet...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa L.; Chilling temperature; Cold tolerance; Complete panicle exsertion; Heritability.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000500009

Using genealogy to improve selection efficiency of pedigree method
Provedor de dados: 63
Autores: Nunes,José Airton Rodrigues; Moreto,Alexsander Luís; Ramalho,Magno Antonio Patto.
In the pedigree method of conducting an autogamous population of segregating plants, the genealogy of the progenies is registered. Although labor-intensive, these data are rarely used. One possibility of exploiting this information is to improve selection efficiency using BLUP (Best Linear Unbiased Prediction). In this study BLUP with genealogy inclusion was compared to the mean in the progenies evaluation conducted by the pedigree method. Progenies of crosses of the common bean lines BRS MG Talismã and BRS Valente in F4:6 and F4:7 were used. The 256 F4:6 progenies were sown in February 2005, in southeast of Brazil, in a 16 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; 16 simple lattice design. The grain yield data were subjected to BLUP analysis with inclusion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BLUP; Selection method; Bean improvement; Heritability; Quantitative genetics.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000100004

Genetic parameters and trends of morphometric traits of GIFT tilapia under selection for weight gain
Provedor de dados: 63
Autores: Reis Neto,Rafael Vilhena; Oliveira,Carlos Antônio Lopes de; Ribeiro,Ricardo Pereira; Freitas,Rilke Tadeu Fonseca de; Allaman,Ivan Bezerra; Oliveira,Sheila Nogueira de.
The main factor considered in breeding programs for fish is growth, which can be assessed in terms of a gain in either weight or body measurements. This study was undertaken to evaluate the morphometric traits of GIFT strain tilapia (Oreochromis sp.) selected for weight gain. The data set used contained information on 6,650 animals. The genetic values of 8,590 animals in a relationship matrix of five generations were predicted. The following morphometric measurements were evaluated: standard length; body depth and body width. Body area and volume were also calculated. Bi-character analyses involving morphometric traits were used to estimate (co)variance components. Heritability, larval and fingerling common environmental effects were estimated for each...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian approach; Genetic correlation; Genetic gain; Heritability.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400001

Genetic control of viviparity in common bean
Provedor de dados: 63
Autores: Pereira,Laís Andrade; Ramalho,Magno Antonio Patto; Abreu,Ângela de Fátima Barbosa; Guilherme,Scheila Roberta.
ABSTRACT: In common bean (Phaseolus vulgaris) harvesting is carried out in the field. It is therefore necessary that cultivars be tolerant to viviparity, i.e., germination of grains still in the pods. Study of the percentage of germination of beans in the pods under laboratory conditions, where humidity content is high, has been proposed. Furthermore, under question is whether the thickness of the pod wall affects water uptake by the pods and, consequently, viviparity. Thus, the aim of the present study was to verify if there is variance among progenies for viviparity and if it is influenced by pod thickness. We assessed the parents, Pérola and ESAL 686, the F1, and a number of segregating generations in two crop seasons, in relation to the percentage of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Plant breeding; Pre-harvest sprouting; Genetic components; Heritability.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000300208

Early generation selection strategy for yield and yield components in white oat
Provedor de dados: 63
Autores: Benin,Giovani; Carvalho,Fernando Irajá Félix de; Oliveira,Antônio Costa de; Lorencetti,Claudir; Valério,Igor Pires; Schmidt,Douglas André Mallmann; Hartwig,Irineu; Ribeiro,Guilherme; Vieira,Eduardo Alano; Silva,José Antonio Gonzales da.
Several studies have searched for higher efficiency on plant selection in generations bearing high frequency of heterozygotes. This work aims to compare the response of direct selection for grain yield, indirect selection through average grain weight and combined selection for higher yield potential and average grain weight of oat plants (Avena sativa L.), using the honeycomb breeding method. These strategies were applied in the growing seasons of 2001 and 2002 in F3 and F4 populations, respectively, in the crosses UPF 18 CTC 5, OR 2 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; UPF 7 and OR 2 &lt;FONT FACE=Symbol&gt;´&lt;/FONT&gt; UPF 18. The ten best genetic combinations obtained for each cross and selection strategy were evaluated in greenhouse yield trials....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Selection method; Heritability; Single plant selection.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400009

Aplicability of phenotypic and canonic correlations and path coefficients in the selection of oat genotypes
Provedor de dados: 63
Autores: Lorencetti,Claudir; Carvalho,Fernando Irajá Félix de; Oliveira,Antônio Costa de; Valério,Igor Pirez; Hartwig,Irineu; Benin,Giovani; Schmidt,Douglas André Mallmann.
Indirect selection through traits of higher heritability and of case measurements can result in larger genetic progress compared to using direct selection. This work was performed with the following objectives: (1) to estimative the phenotypic correlations between individual plant grain yield and agronomic traits of importance in the selection of white oat (Avena sativa L.) genotypes; (2) to identify traits that have the higher direct and indirect effects on grain yield; (3) to determine the intensity of association between primary and secondary components of grain yield; and, (4) to evaluate the consistency of these estimates using five oat genotypes crossed in a diallel format. The number of panicles per plant (NPP) showed to be the trait highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena sativa L.; Heritability; Indirect selection.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000100003

Genetic variability for girth growth and rubber yield in Hevea brasiliensis
Provedor de dados: 63
Autores: Gonçalves,Paulo de Souza; Silva,Marcelo de Almeida; Gouvêa,Ligia Regina Lima; Scaloppi Junior,Erivaldo José.
Basic knowledge of genetic characteristics of populations is necessary to conduct effective breeding and selection. The objective of this paper is describing the genetic variation of rubber yield and the correlation with other traits, and estimating the genetic parameters for girth growth and total number of latex vessels. Sixty seven clones of Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg. were tested at five sites during 10 years. Characters girth growth at panel opening and rubber yield, showed broad sense heritability on plot mean level, from 0.32 to 0.66 and 0.59 to 0.92, respectively. Predicted genetic gains equal to 0.73 cm and 0.79 g increase respectively on girth and yield in the opening panel and mature phases seems realistic, even with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rubber tree; Heritability; Genetic correlations; Genotype-environment interaction.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300006

Genetic analysis for sooty mold resistance and heart of palm yield in Archontophoenix
Provedor de dados: 63
Autores: Bovi,Marilene Leão Alves; Resende,Marcos Deon Vilela de; Sáes,Luís Alberto; Uzzo,Roberta Pierry.
Archontophoenix palms, utilized both as ornamental species and as a source of high-quality heart of palm, are susceptible to sooty mold, a disease coupled with aphid infestation, which affects photosynthesis and causes unpleasant, darkish palm appearance. Scoring rates for sooty mold resistance and three growth traits were assessed under field conditions in 24 open-pollinated half-sibs families, 28 months after planting, aiming to identify genetic variability for sooty mold resistance; estimate genetic parameters for this trait and plant height, diameter and number of leaves; estimate genetic and phenotypic correlation for the four traits and evaluate selection methods for heart of palm production through multi-trait index selection based on growth traits....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Capnodium; Cerataphis; Genetic gain; Heritability; King palm.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200009

Quantitative variation in the tropical maize population, ESALQ-PB1
Provedor de dados: 63
Autores: Andrade,João Antonio da Costa; Miranda Filho,José Branco de.
Good yield and intermediate plant height, ear height, and tassel size characterize the maize population ESALQ-PB1 as an outstanding breeding population. Estimates of genetic parameters are reported for 13 traits: plant height (PH), ear height (EH), ear placement (EP), tassel length (TL), tassel weight (TW), tassel branch number (TB), ear weight (EW), total grain weight (GW), ear length (EL), ear diameter (ED), kernel row number (RN), kernel number per row (KR) and prolificacy (PR). Results refer to one location and one year. Genetic variation was detected for all traits, and the estimates of the additive genetic variance are presented. The coefficients of heritability (individual basis) varied from 0.14 to 0.72 and were considered high for PH, EH and TB;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic parameters; Genetic variability; Heritability; Recurrent selection.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200011

Genetic parameters for post weaning growth of Nellore cattle using polinomyals and trigonometric functions in random regression models
Provedor de dados: 63
Autores: Macedo,Osmar Jesus; Barbin,Décio; Mourão,Gerson Barreto.
Covariance functions and random regression models have been considered as an alternative for data adjustment, in sequence, stemming from the same animal along time and which presents a structured pattern of covariance. Aiming to evaluate the performance of random regression models based on the Legendre, modified Jacobi and trigonometric functions, data concerning the weights of Nellore breed animals were used from birth to the 800th day of life, in models that assumed direct additive and animal permanent environmental effects coefficients. The Schwarz Bayesian information criterion (BIC) led to the selection of the models Legendre of order six (ML6), Jacobi of order five (MJ5) and trigonometric of order six (MT6), the ML6 model presenting the lowest BIC....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Additive variance; Heritability; Jacobi; Legendre; Longitudinal data.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400014

Assessment of genetic parameters of degradability in maize grains due to indentation scores
Provedor de dados: 63
Autores: Davide,Livia Maria Chamma; Ramalho,Magno Antônio Patto; Figueiredo,Ulisses José de; Souza,João Cândido de.
Maize (Zea mays L.) cultivars with dent grains present higher starch and dry matter ruminal degradability than those with flint grains. This study aimed to assess genetic parameters of degradability in maize grains of different textures and to verify whether there is an association between grain indentation score and ruminal dry matter (RDM) degradability. The evaluated progenies were obtained from the cross between the varieties Cristal (flint) and Cunha (dent), previously selected for grain hardness. Progenies were evaluated for an indentation score using a visual grading scale ranging from 1 (flint) to 5 (dent). To assess the RDM degradability, 5 g were cut into halves, weighed (five grams), stored in bags made of 100% "failet" cloth and incubated for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grain hardness; Ruminal dry matter degradability; Heritability.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300012

การประมาณค่าพารามิเตอร์ทางพันธุกรรมการให้น้ำนมในแพะลูกผสม โดยใช้โมเดลวันทดสอบรีเกรซชั่นสุ่ม
Provedor de dados: 106
Autores: Thumrong Thongchumroon; Mongkol Thepparat; Monchai Duangjinda; Suwit Anothaisinthawee.
Objective of this study was to estimate genetic parameters in crossbred goat between Thai native with Anglo-Nubian (AN), Toggenburg (TG), Saanen (SA) and Alpine (AP), for milk yield base on random regression test day model (RRTDM). The data analysis was based on 1,438 test day milk records between 2004 and 2006. RRTDM based on second-order Legendre polynomial function for additive genetic and permanent environment effects. Residual variance was adjusted for heterogeneity using exponential function. Heritability estimates were 0.088-0.535 and decreased from the beginning to the end of lactation with average of 0.238. The genetic lactation curve obtained from this study is useful for increasing accuracy of breeding values and selection strategies for...
Tipo: Collection
Palavras-chave: Crossbred dairy goat; Milk yield; Heritability; Random regression test day model; แพะนม; พันธุ์ลูกผสม; ปริมาณน้ำนม; อัตราพันธุกรรม; โมเดลวันทดสอบรีเกรซชั่นสุ่ม.
Ano: 2011
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5180

Genetic control of partial resistance to Asian soybean rust doi: 10.4025/actasciagron.v36i1.16919
Provedor de dados: 1
Autores: Martins, Juliana Araújo Santos; Instituto Federal de Educação, Ciência e Tecnologia do Triângulo Mineiro; Juliatti, Fernando Cezar; Universidade Federal de Uberlandia.
The genetic control of rust resistance was studied using the Caiapônia x IAC-100 and Luziânia x Potenza crosses. The F2 and F3 generations were evaluated. Rust severity was quantified through visual assessment of the middle third of three leaflets per plant and performed by three different evaluators; the average score was calculated foreach individual plant. From these data, we estimated the mean and variance of the genetic components by employing the weighted least squares method. The estimated number of genes and broad- and narrow-sense heritabilities were also obtained. It was concluded that rust resistance is a characteristic controlled by 2 to 23 genes that are predominantly dominant. The estimate of narrow-sense heritability was greater than 70% for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.00.00.00-4; 5.01.00.00-9; 5.01.02.01-0; 5.01.03.05-9 Glycine max; Phakopsora pachyrhizi; Dominance variance; Heritability; Race non-specific disease resistance Melhoramento Vegetal e Fitopatologia.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/16919

Genetics of the concentration of copper in common bean seeds - doi: 10.4025/actasciagron.v35i3.16520
Provedor de dados: 1
Autores: Poersch, Nerison Luís; Universidade Federal de Santa Maria; Ribeiro, Nerinéia Dalfollo; Universidade Federal de Santa Maria; Rosa, Daniele Piano; Universidade Federal de Santa Maria; Maziero, Sandra Maria; Universidade Federal de Santa Maria; Jost, Evandro; Instituto Federal de Educação, Ciência e Tecnologia Farroupilha.
The common bean (Phaseolus vulgaris L.) is an important source of copper in human nutrition. The objective of this research was to investigate the possible maternal effects on copper concentrations in the seeds of the common bean, to estimate the heritability and the selection gains in early hybrid generations for the characteristic of copper concentration and to evaluate the potential for genetic improvement. The controlled crossings were performed among IAPAR 44 x IAPAR 31 and Diamante Negro x TPS Bonito cultivars. The reciprocal F1, and F2 generations, as well as the backcross populations, were produced by each hybrid combination. The range of variation in the copper concentration among the tested progenies was from 1.07 to 7.75 mg kg-1 dry matter, and...
Palavras-chave: Agronomia Phaseolus vulgaris; Embryo; Maternal effect; Heritability; Early generation Melhoramento Vegetal.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/16520

Genetic parameters of iron and zinc concentrations in Andean common bean seeds
Provedor de dados: 1
Autores: Zemolin, Allan Emanoel Mezzomo; Ribeiro, Nerinéia Dalfollo; Casagrande, Cleiton Renato; Silva, Maykon Júnior da; Arns, Fernanda Daltrozo.
The genetic parameter estimates of the iron and zinc concentrations in Andean common bean seeds were obtained using the IAC Boreal × Light Red Kidney and Ouro Branco × Light Red Kidney crosses. The parents and the F1, F1 reciprocal, F2, F2 reciprocal, and backcross BC11 and BC12 generations were evaluated in a field experiment that was carried out in the state of Rio Grande do Sul, Brazil. The iron concentration in Andean common bean seeds ranged from 24.70 to 102.40 mg kg-1 dry matter (DM), the zinc concentration ranged from 10.73 to 37.50 mg kg-1 DM, and no significant maternal effect was observed. The narrow-sense heritability ranged from low (h2n= 19.04%) to high (h2n= 63.60%) for the concentrations of iron and zinc, respectively. Hybrid vigor and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ciências Agrárias gain with selection; Heritability; Heterosis; Inheritance pattern; Maternal effect; Phaseolus vulgaris Fitotecnia.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30652

Brachiaria brizantha Stapf access evaluation and estimates of genetic parameters for agronomical characters - DOI: 10.4025/actasciagron.v31i1.6605
Provedor de dados: 1
Autores: Basso, Kelen Cristina; UEM; Resende, Rosangela Maria Simeão; EMBRAPA; Valle, Cacilda Borges do; EMBRAPA; Gonçalves, Manoel Carlos; UFGD; Lempp, Beatriz; UFGD.
Currently, Brachiaria brizantha Stapf is the tropical grass with the largest cultivated area in Brazil, being responsible for a major part of the seed market and for the increase in animal production. There are several superior genotypes available in germplasm banks, collected from the African continent and in need of evaluation. The selection of these genotypes must be based on predicted genotype values of the individuals in function of being perennial plants and of unsexed propagation. The standard procedure for the prediction of genetic values is the individual BLUP (Best Linear Unbiased Predictor), using estimates of variance components achieved by the restricted maximum likelihood (REML) on an individual model. With the aim of selecting B. brizantha...
Palavras-chave: Genetic correlation; Tropical forage; Heritability; REML/BLUP; Repeatability; Genotypes 5.02.01.03-4 Genética e Melhoramento Florestal correlação genética; Gramínea tropical; Herdabilidade; REML/BLUP; Repetibilidade; Genótipos.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6605

Repetibilidade e correlações fenotípicas de caracteres do fruto de bacuri no Estado do Maranhão - DOI: 10.4025/actasciagron.v31i4.723
Provedor de dados: 1
Autores: Silva, Ricardo Gonçalves; UFMA; Chaves, Maria da Cruz Lima; Agência Estadual de Pesquisa Agropecuária e Extensão Rural do Maranhão; Arnhold, Emmanuel; UFMA; Cruz, Cosme Damião; UFV.
O objetivo deste trabalho foi estimar parâmetros de repetibilidade e correlações fenotípicas em caracteres do fruto do bacuri (Platonia insignis Mart.). Foram avaliadas seis matrizes (genótipos) localizadas em seis municípios do Estado do Maranhão. Oito frutos foram colhidos por matriz, sendo mensurados diâmetro, comprimento, cavidade interna, peso e número de sementes por fruto, espessura da casca, peso de casca mais semente, rendimento de polpa, número de segmentos partenocárpico, Brix e acidez total titulável. Os dados foram submetidos à análise de variância. Os genótipos apresentaram variabilidade genética significativa para todos os caracteres, em nível de 1% de probabilidade pelo teste F. Apenas para cavidade interna do fruto, acidez total titulável...
Palavras-chave: 5.02.01.03-4    Genética e Melhoramento Florestal variância genética; Variância ambiental; Herdabilidade; Seleção 5.00.00.00-4 Ciências Agrárias; 5.01.00.00-9 Agronomia; 5.01.03.00-8 Fitotecnia; 5.01.03.05-9 Melhoramento Vegetal; Genetic variance; Environmental variance; Heritability; Selection.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/723

Interação genótipo-ambiente na produção de leite de vacas da raça Holandesa - DOI: 10.4025/actascianimsci.v30i2.4706
Provedor de dados: 2
Autores: Falcão, Alencariano José da Silva; UFT; Martins, Elias Nunes; UEM; Costa, Cláudio Napolis; EMBRAPA; Mazucheli, Josmar; UEM.
Os efeitos, sobre a avaliação genética da interação reprodutor-região, foram investigados analisando-se 108.702 registros de produção de leite (PL305) de vacas da raça Holandesa, pertencentes a rebanhos de Minas Gerais, São Paulo, Paraná, Sanata Catarina e Rio Grande do Sul. Um modelo animal multicarácter foi aplicado para estimar os componentes de variância e covariância utilizando amostragem de Gibbs. As médias a posteriori da variância genética de Santa Catarina e Rio Grande do Sul foram superiores (p &lt; 0,001) às estimadas nos demais estados e iguais (p &gt; 0,05) entre si. As herdabilidades variaram entre 0,24 e 0,38. As correlações genéticas entre os estados foram de baixa magnitude e variaram entre 0,07 a 0,33. Os valores de correlação de Spearman...
Palavras-chave: 5.05.04.00-2    Reprodução Animal cadeia de Markov; Correlação; Componentes de variância; Herdabilidade. Markov chain; Correlation; Variance components; Heritability.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/4706

Genetic components of birth weight of texel sheep reared in extensive system
Provedor de dados: 2
Autores: Amarilho-Silveira, Fernando; Dionello, Nelson José Laurino; Mendonça, Gilson de; Motta, Jaqueline Freitas; Fernandes, Tiago Albandes; Silva, Nicholas da Silveira.
This study aimed to estimate the components of (co)variance, genetic and phenotypic parameters and trends for birth weight. We used 783 birth weight records, between 2012 to 2016, of Texel sheep reared in extensive system. The components of (co)variance and the genetic parameters were estimated using six different animal models, using the restricted maximum likelihood method (REML). The model that best fit the data was Model 3, with estimates of direct additive genetic variance of 0.004, maternal permanent environment variance of 0.164, heritability coefficient of 0.011 and phenotypic variation attributed to the maternal permanent environment of 0.394. For the genetic trend, we observed a genetic gain of 0.413% and for the phenotypic trend, a phenotypic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zootecnia  Genética e Melhoramento dos Animais Domésticos maternal permanent environment; Heritability; Sheep breeding; Direct additive variance.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/36481

Genetic trend for adjusted weight at 205, 365 and 550 days of age of Nellore cattle from Northern Brazil - 10.4025/actascianimsci.v34i1.12172
Provedor de dados: 2
Autores: Santos, Geneíldes Cristina de Jesus; Universidade Federal do Tocantins; Lopes, Fernando Brito; Universidade Federal de Goiás - UFG; Marques, Ednira Gleida; Associação Brasileira dos criadores de Zebu - ABCZ; Silva, Marcelo Corrêa da; Universidade Federal de Goiás - UFG; Cavalcante, Tânia Vasconcelos; Universidade Federal do Tocantins; Ferreira, Jorge Luis; Universidade Federal do Tocantins - UFT.
Effective researches assessing the efficiency of cattle herds in Northern Brazil are incipient. This study aimed to evaluate the direct additive and maternal genetic trends of weights adjusted to 205 (P205), 365 (P365) and 550 (550) days of age in Nellore animals raised on pasture, born between 1997 and 2007, from Northern Brazil. Estimative of (co)variance components used in the prediction of breeding values were obtained by derivative-free restricted maximum likelihood method (REML) using the MTDFREML program. The genetic trends of direct and maternal genetic effects were obtained by the regression of the annual average of predicted breeding values. The heritability estimates for P205, P365 and P550 were 0.33, 0.51 and 0.41, with genetic gain of 0.494,...
Palavras-chave: 5.04.02.00-5 (co)variância; Ganho genético; Herdabilidade; Zebu (co)variance; Genetic gain; Heritability; Zebu.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/12172

Estimates of genetic and phenotypic parameters for reproductive traits in Iranian native Kordi sheep
Provedor de dados: 2
Autores: Saghi, Davoud Ali; Shahdadi, Ali Reza.
The data set for estimation of genetic and phenotypic parameters of reproductive traits in Kordi sheep were collected from 1996 to 2013. The reproductive traits included age at first lambing (AFL), number of lambs born (NLB/EL) and weaned (NLW/EL) per ewe in each lambing, total weight of lambs born (TWLB/EL) and weaned (TWLW/EL) per ewe in each lambing, total number of lambs born (TNLB) and weaned (TNLW) per ewe, total weight of lambs born (TWLB) and weaned (TWLW) per ewe. The genetic parameters were estimated through restricted maximum likelihood method using WOMBAT. The effects of environmental factors (year of lambing, type of birth, maternal age at lambing) on all reproductive traits were significant (p &lt; 0.01). Direct heritability, maternal...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heritability; Direct and maternal effect; Genetic and phenotypic correlation; Animal models.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/35378

Genetic analysis of fertility traits of Holstein dairy cattle in warm and temperate climate
Provedor de dados: 2
Autores: Rahbar, Rabie; Aminafshar, Mehdi; Abdullahpour, Rohullah; Chamani, Mohammad.
The edited data set for the estimation of heritability, genetic and phenotypic correlations of fertility traits contained up to 23,402 records from 10,894 cows calved between 2001 and 2015. Heritability estimates for success in first service (FS), gestation length (GL), number of inseminations (NI), insemination outcome (IO), calving interval (CI), calving birth weight (CBW) and days open (DO) were low and ranged between 0.016 (DO) and 0.123 (GL). Repeatability of fertility traits was estimated to vary from 0.021 (FS) to 0.411 (IO). The genetic correlations between DO × CI, DO × NI and CI × NI were positive and nearly perfect (0.98, 0.88 and 0.88, respectively), while those between DO × IO and CI × IO were negative (-0.98 and -1, respectively). Further,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heritability; Repeatability; Genetic correlation; Phenotypic correlation; Heat stress.
Ano: 2016
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/31377

Genetic parameters, path analysis and indirect selection of agronomic traits of cassava germplasm
Provedor de dados: 42
Autores: DINIZ,RAFAEL P.; OLIVEIRA,EDER J. DE.
Abstract: This study aimed to estimate genetic parameters and correlations between morphological, agronomic and root quality traits of cassava plants, as well as to study cause and effect relationships through path analysis. A total of 814 genotypes were evaluated from 2011 to 2015. The joint analysis of the data was performed by the mixed models approach. The predicted genetic values of the genotypes were used to estimate the genetic correlations among as well the path analysis. The estimates of heritability of the genotype means ranged from 0.31 (commercial fresh root yield – CRY) to 0.62 (plant height - PLH). The highest genetic correlation coefficient estimates were observed for starch yield (STY) × total fresh root yield (FRY) (0.97). The results of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manihot esculenta Crantz; Heritability; Correlation; Correlated response.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500859

Interactive effects of genotype x environment on the live weight of GIFT Nile tilapias
Provedor de dados: 42
Autores: OLIVEIRA,SHEILA N. DE; RIBEIRO,RICARDO P.; OLIVEIRA,CARLOS A.L. DE; ALEXANDRE FILHO,LUIZ; OLIVEIRA,ALINE M.S.; LOPERA-BARRERO,NELSON M.; SANTANDER,VICTOR F.A.; SANTANA,RENAN A.C.
ABSTRACT In this paper, the existence of a genotype x environment interaction for the average daily weight in GIFT Nile tilapia (Oreochromis niloticus) in different regions in the state of Paraná (Brazil) was analyzed. The heritability results were high in the uni-characteristic analysis: 0.71, 0.72 and 0.67 for the cities of Palotina (PL), Floriano (FL) and Diamond North (DN), respectively. Genetic correlations estimated in bivariate analyzes were weak with values between 0.12 for PL-FL, 0.06 for PL and 0.23 for DN-FL-DN. The Spearman correlation values were low, which indicated a change in ranking in the selection of animals in different environments in the study. There was heterogeneity in the phenotypic variance among the three regions and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; Fish; Genetic gain; Heritability; Genetic correlation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602931

Genetic parameters for performance and carcass traits in a paternal 1 lineage of broiler
Provedor de dados: 42
Autores: CRUZ,VALDECY A.R.; GRUPIONI,NATALIA V.; MENDONÇA,GABRIELA G.; VENTURINI,GUILHERME C.; LEDUR,MONICA C.; PEIXOTO,JANE O.; MUNARI,DANISIO P.
Abstract  The objective of this study was to estimate variance components for performance and carcass traits in a paternal broiler line. The (co)variance components were estimated by the restricted maximum likelihood method applied to the animal model, including the fixed effect of group (sex and hatch) and additive genetic and residual as random effects. Estimated heritability for performance traits ranged from 0.09 to 0.42. The genetic correlations between traits ranged from -0.50 to 0.97. The heritability estimates of feed intake, weight gain, and feed conversion from 35 to 41 days of age were of low magnitude. The genetic correlations among them were favorable to genetic selection. These results suggest that moderate genetic gain can be obtained to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass; Feed conversion; Genetic correlation; Heritability; Weight gain.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201006

Genetic parameters in female reproductive traits of Nile tilapia (Oreochromis niloticus)
Provedor de dados: 42
Autores: YOSHIDA,GRAZYELLA M.; OLIVEIRA,CARLOS A.L. DE; KUNITA,NATALÍ M.; RIZZATO,GABRIEL S.; RIBEIRO,RICARDO P.
ABSTRACT Genetic parameters for reproductive traits in female Nile tilapia were estimated in this study using Bayesian inference method. The data set presented information from 451 Nile tilapia females that were evaluated at two different places in Maringá - Paraná - Brazil (hapas of 1 and 10 m³) and at one location in Alfenas - Minas Gerais - Brazil. A spawning examination was conducted once a week from October 2012 to March 2013 for a total of 23 weeks of evaluation. Single-trait analyses for spawning success, multiple spawning, spawning frequency, and volume of eggs/female were performed by using the software MTGSAM Threshold. The heritability estimates were 0.14, 0.16, 0.53, and 0.08 for spawning success, multiple spawning, spawning frequency and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian Inference; Heritability; Oreochromis niloticus; Repeatability; Spawning.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502515

Genetic parameters estimates for gestation length in beef cattle
Provedor de dados: 45
Autores: Rocha,J.C.M.C.; Tonhati,H.; Alencar,M.M.; Lôbo,R.B.
Variance components were estimated for gestation length fitting the additive direct effect of calf, maternal genetic effect and sire effect as random effects. The statistical models also included the fixed effects of contemporary group, that included the date of breeding (AI), date of birth, and sex of calf, and the covariate age of dam at calving (linear and quadratic). Two different models were used, model 1 considering GL as a trait of the calf, and model 2 considering GL as a trait of the dam. The means of gestation length for the purebred animals were 294.55 days (males) and 293.34 days (females), while for the crossbred animals they were 292.49 days (males) and 292.55 days (females). Variance components for the purebred animals, fitting model 1, were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Gestation length; Heritability; Repeatability.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352005000600013

Genetic evaluation of milking buffaloes (Bubalus bubalis): bull ranking
Provedor de dados: 45
Autores: Marques,L.C.; McManus,C.; Peripolli,V.; Araújo,C.V.; Matos,A.S.; Costa,J.S.; Silva,C.S.; Sales,R.L.; Camargo Júnior,R.N.C.; Laureano,M.M.M.; Marques,J.R.F.
ABSTRACT The objective of this study was to evaluate genetic aspects related to production and reproductive efficiency of Murrah and Mediterranean buffaloes and their crosses. A ranking of bulls from Embrapa Eastern Amazonia was also composed to guide assisted mating. Birth records of 2,322 Murrah, Mediterranean, and crossbred buffaloes from the Embrapa Eastern Amazon herd, from 1953 to 2013, as well as information on production and reproductive traits were used. Genetic analyzes were performed in the WOMBAT software using the animal model with two-trait analysis. While heritability (h2) for total milk production (TMP) and fat milk percentage (F) were generally high, for reproductive traits h2 tended to be low. Genetic correlations for TMP with the other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic management; Heritability; Correlation; Reproductive efficiency.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000501712

Components of (co)variance of the days open in Siboney dairy cows
Provedor de dados: 45
Autores: González-Peña,D.; Espinoza-Villavicencio,J.L.; Guerra,D.; Palacios,A.; Évora,J.C.; Portales,A.
The records of 63,406 calvings of Siboney dairy cows (5/8 Holstein 3/8 Cuban Zebu) were used to estimate the components of covariance of the days open (DO). Five models were used: of repeatability; univariate; bivariate; of random regression with Legendre polynomials and the parity number as predicting variable; and a model of random regression with Legendre polynomials and heterogeneity of the residual variance. The heritability obtained with the univariate model was 0.09 in the first calving and decreased to 0.05 in the fifth. A higher estimate of heritability (0.12) was obtained with the repeatability model. When the model of random regression with heterogeneity of the residual variance was used, the heritability was higher than the values estimated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dairy cow; Genetic correlations; Heritability; Postpartum interval; Days open.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352010000100019

Genetics and expected selection gain for growth traits in Eugenia dysenterica DC. populations
Provedor de dados: 53
Autores: Aguiar,Ananda Virginia de; Vencovsky,Roland; Chaves,Lázaro José; Moura,Mara Fernandes; Morais,Lizz Kezzy de.
The objective of this study was to estimate genetic parameters of quantitative traits in a living germplasm collection of Eugenia dysenterica. The genetic material consisted of 110 progenies derived from 10 natural Eugenia dysenterica subpopulations sampled in the southeastern region of the state of Goiás. The experiment was established in a complete randomized block design, with 110 treatments, four replications and one tree per plot. The study variables were total height, stem diameter and respective growth rates. After the analysis of variance some genetic parameters were estimated. The levels of genetic variation in the collection were high and the highest proportion was found within subpopulations. Highest coefficients of heritability and genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eugenia dysenterica; Pre-breeding or screening; Genetic conservation; Cerrado; Genetic parameters; Heritability.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052009000300009

Genetic control of aluminum tolerance in tropical maize germplasm
Provedor de dados: 53
Autores: Coelho,Caroline de Jesus; Bombardelli,Renato Gustavo Hoffmann; Schulze,Guilherme Stalchmidt; Caires,Eduardo Fávero; Matiello,Rodrigo Rodrigues.
ABSTRACT Aluminum (Al) toxicity is the most limiting factor to maize crop productivity in acid soils. Therefore, the understanding of inheritance of Al tolerance in maize is important for the developmentof more adequate procedures for Al tolerant genotypes selection. In this sense, the objectives of this study were to determine the inheritance, and the general (GCA) and specific combining ability (SCA) for Al tolerance in tropical maize. First, we evaluated diallel crosses of maize from landrace and hybrid germplasms for Al tolerance through the minimal solution methodology. The DIF data (root growth difference) were analyzed by Griffing diallel model. Later the additive-dominant genetic model proposed by Mather and Jinks (1971) was used to estimate the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Combining ability; Heritability; Inheritance; Zea mays L.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000100071

Estimation models of variance components for farrowing interval in swine
Provedor de dados: 52
Autores: Cavalcante Neto,Aderbal; Lui,Jeffrey Frederico; Sarmento,José Lindenberg Rocha; Ribeiro,Maria Norma; Monteiro,José Mauro Costa; Fonseca,Carlos; Tonhati,Humberto.
The main objective of this study was to evaluate the importance of including maternal genetic, common litter environmental and permanent environmental effects in estimation models of variance components for the farrowing interval trait in swine. Data consisting of 1,013 farrowing intervals of Dalland (C-40) sows recorded in two herds were analyzed. Variance components were obtained by the derivative-free restricted maximum likelihood method. Eight models were tested which contained the fixed effects(contemporary group and covariables) and the direct genetic additive and residual effects, and varied regarding the inclusion of the maternal genetic, common litter environmental, and/or permanent environmental random effects. The likelihood-ratio test indicated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Common litter; Maternal effect; Permanent environment; Heritability; Repeatability; Swine.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100009

Genetic analysis of seed morphological traits and its correlations with Grain yield in common bean
Provedor de dados: 52
Autores: Dalla Corte,Aline; Moda-Cirino,Vania; Arias,Carlos Alberto Arrabal; Toledo,José Francisco Ferraz de; Destro,Deonisio.
This work investigated the genetic control of seed morphological traits and its correlations with grain yield in common bean. Three crossings among bean cultivars with different growth habit and seed characteristics were analyzed. F1 progenies gave origin to F2, RC1P1F1 and RC1P2F1 generations. Random samples of seeds from F2 generations and parents, F1 and backcrossings were sown during the season 2003/2004. Plant grain yield and seed morphological traits were determined by a sample of 150 plants from F2 generations and 20 plants from parents, F1 and backcrosssings. Genetic effects involved in each crossing were obtained from estimates of genetic components means and genetic and environmental components of phenotypical variance. Results showed that the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic inheritance; Shape seed; Heritability; Common breeding.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000100004

Genetic and environmental influences on blood pressure and physical activity: a study of nuclear families from Muzambinho, Brazil
Provedor de dados: 56
Autores: Forjaz,C.L.M.; Bartholomeu,T.; Rezende,J.A.S.; Oliveira,J.A.; Basso,L.; Tani,G.; Prista,A.; Maia,J.A.R.
Blood pressure (BP) and physical activity (PA) levels are inversely associated. Since genetic factors account for the observed variation in each of these traits, it is possible that part of their association may be related to common genetic and/or environmental influences. Thus, this study was designed to estimate the genetic and environmental correlations of BP and PA phenotypes in nuclear families from Muzambinho, Brazil. Families including 236 offspring (6 to 24 years) and their 82 fathers and 122 mothers (24 to 65 years) were evaluated. BP was measured, and total PA (TPA) was assessed by an interview (commuting, occupational, leisure time, and school time PA). Quantitative genetic modeling was used to estimate maximal heritability (h²), and genetic and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Exercise; Hypertension; Environmental influence; Heritability; Genetic epidemiology.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012001200023

Bayesian Analysis of the Genetic Control of Survival in F3 Families of Common Bean
Provedor de dados: 117
Autores: Mora,Freddy; Gonçalves-Vidigal,Maria C; Santos,Alexandra I.
The objectives of this study were to examine the genetic control of survival in segregant families F3 of the common bean (Phaseolus vulgaris L.) in southern Brazil during the 2004-2005 growing season, to identify useful genotypes for the breeding program of this crop, and to determine the genetic association between survival and weight of 100 seeds (production trait; P100). A Bayesian approach was used to predict breeding values and to estimate variance components. Survival was recorded as a binary response: dead plant or live plant during harvest. The total population consisted of 11,520 individual plants. The difference in the magnitude between the best and the worst families was as high as 22%, and varied from 57 to 73%. Survival was found to be highly...
Tipo: Journal article
Palavras-chave: Genetic improvement; Breeding; Gibbs algorithm; Heritability.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000400003

Inheritance of Seed Weight in Large-Seed Grass Pea Lathyrus sativus L
Provedor de dados: 117
Autores: Mera,Mario.
Mean seed weight (MSW) is a relevant trait in grass pea (Lathyrus sativus L.) commercialization because large grains are preferred in Western markets. Extending the knowledge on its mode of inheritance among large-seeded types would be useful in breeding programs, and therefore it was the objective of this work. A broad range of MSW is found in grass pea, starting at about 30 mg. Three lines (LS-97, LS-8, and LS-2026) within the large-seeded group but with significantly different MSW (179, 360 and 470 mg, respectively), were crossed in a complete diallel. Part of the F1 seed was sown and the remainder was stored. F1 plants from each cross were allowed to produce F2 seed and some were backcrossed to their respective parents. Parents, F1, F2, and backcross...
Tipo: Journal article
Palavras-chave: Grass pea; Heritability; Cool-season grain legumes.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300002

Genetic Analysis of Relative Cell Injury Percentage and Some Yield Contributing Traits in Wheat Under Nomral and Heat Stress Conditions
Provedor de dados: 117
Autores: Farooq,Jehanzeb; Khaliq,Ihsan; Kashif,Muhammad; Ali,Qurban; Mahpara,Shahzadi.
Several wheat genotypes were screened against heat stress. Seven wheat (Triticum aestivum L.) cultivars obtained after screening against heat classified as tolerant, moderately tolerant, and susceptible to heat stress, were mated in a complete diallel mating system to study the inheritance pattern of relative cell injury percentage (cell injury %) and some yield contributing parameters under normal and heat stress conditions. Significant genotypic differences were found (P &lt; 0.01) for all the studied traits under both regimes. The scaling test disclosed partial adequacy for traits such as days to heading and days to maturity, but for flag leaf area and relative cell injury %, it showed full sufficiency under both environments. The model for grain yield...
Tipo: Journal article
Palavras-chave: Relative cell injury percentage; Additive components; Adequacy test; Heritability; Wheat; Diallel.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000400003

Diversity of Genetic Resources and Genetic Association Analyses of Green and Dry Chillies of Eastern India
Provedor de dados: 117
Autores: Chattopadhyay,Arup; Baran Sharangi,Amit; Dai,Nuka; Dutta,Subrata.
Chilli (Capsicum annuum L.) is regarded as one of the main commercial vegetable and spice crops at the global level. Maximum diversity can be noted among the cultivars/landraces available in India with respect to shape, size, yield, quality, and other traits. The present experiment was conducted to identify the most promising chilli variety suited for green and dry purposes, to study the genetic variability for different traits and to assess the association of different yield attributing traits with the green and dry yield of chilli. Thirty four genotypes were characterized during a 2-yr period. Most of the genotypes possessed the character constellation of C. annuum. Two genotypes, ‘Chaitali Pointed’ and ‘BC CH Sel-4’ were found most promising with...
Tipo: Journal article
Palavras-chave: Quantitative traits; Qualitative traits; Genetic variability; Heritability; Selection index.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000300002

Genetic parameters for milk yield and reproduction traits in the Chilean Dairy Overo Colorado cattle breed
Provedor de dados: 118
Autores: Montaldo,Hugo H; Trejo,Carlos; Lizana,Carlos.
The objective of this study was to estimate genetic parameters for milk production and reproduction traits using phenotypic and pedigree information from the Dairy Overo Colorado breed from southern Chile. Single- and multi-trait mixed models were used to analyze the data. Analyses were performed using ASReml software. The heritability estimates for milk yield, fat yield, protein yield, fat content, protein content, age at first calving and calving interval were 0.29 ± 0.04, 0.34 ± 0.04, 0.30 ± 0.04, 0.56 ± 0.04, 0.56 ± 0.04, 0.01 ± 0.07 and 0.002 ± 0.02, respectively. The genetic correlations between yield traits were high and positive (&amp;#8805; 0.81). The genetic correlations of milk yield with fat content (-0.32) and protein content (-0.34) were...
Tipo: Journal article
Palavras-chave: Breeding; Chile; Correlation; Heritability; Local cattle breed.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000100003

Multi-Trait analysis of growth traits: fitting reduced rank models using principal components for Simmental beef cattle
Provedor de dados: 65
Autores: Mota,Rodrigo Reis; Costa,Edson Vinícius; Lopes,Paulo Sávio; Nascimento,Moyses; Silva,Luciano Pinheiro da; Silva,Fabyano Fonseca e; Marques,Luiz Fernando Aarão.
ABSTRACT: The aim of this research was to evaluate the dimensional reduction of additive direct genetic covariance matrices in genetic evaluations of growth traits (range 100-730 days) in Simmental cattle using principal components, as well as to estimate (co)variance components and genetic parameters. Principal component analyses were conducted for five different models-one full and four reduced-rank models. Models were compared using Akaike information (AIC) and Bayesian information (BIC) criteria. Variance components and genetic parameters were estimated by restricted maximum likelihood (REML). The AIC and BIC values were similar among models. This indicated that parsimonious models could be used in genetic evaluations in Simmental cattle. The first...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Computational demand; Genetic parameters; Heritability.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000901656

Genetic parameters for egg production in meat quails through partial periods
Provedor de dados: 65
Autores: Ribeiro,Jeferson Corrêa; Silva,Luciano Pinheiro da; Soares,Aline Camporez Crispim; Caetano,Giovani da Costa; Leite,Carla Daniela Suguimoto; Bonafé,Cristina Moreira; Sousa,Mariele Freitas; Torres,Robledo de Almeida.
ABSTRACT: We estimated genetic and phenotypic parameters for egg production in meat-type quails aiming to propose an optimal age for selection through partial record egg production. Data of 3,503 female quails from two strains (namely, UFV1, with 1,811 and UFV2 with 1,692 females) were used. Egg production was assessed by the number of eggs recorded after 42 days of age and each partial period consisted on 35 days of egg production forward. Covariance components were estimated by using single and bivariate animal model, comprising each partial period of egg production and full egg production period (one year of egg laying). Regarding strain UFV1, heritability estimates ranges from 0.03 to 0.16, and for strain UFV2 0.20 to 0.25. The highest genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coturnix coturnix; Genetic correlation; Genetic evaluation; Heritability; Variance components.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000400653

Estimates of (co)variance components and genetic parameters for growth traits in Suffolk lambs
Provedor de dados: 65
Autores: Tamioso,Priscilla Regina; Alberti Filho,Jaime Luiz; Dias,Laila Talarico; Teixeira,Rodrigo de Almeida.
The study aimed to estimate the components of (co)variance and heritability for weights at birth (BW), weaning (WW) and 180 days of age (W180), as well as the average daily gains from birth to weaning (ADG1), birth to 180 days of age (ADG2) and weaning to 180 days of age (ADG3) in Suffolk sheep. Thus, three different single-trait animal models were fitted, considering the direct additive genetic effect (Model 1), the direct additive genetic and maternal permanent environmental effects (Model 2), and in Model 3, in addition to those in Model 2, the maternal additive genetic effect was included. After comparing models through the likelihood ratio test (LRT), model 3 was chosen as the most appropriate to estimate heritability for BW, WW and ADG1. Model 2 was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Average daily weight gain; Body weight; Heritability; Maternal effects; Suffolk.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013001200016

Genotypic parameters for egg production in pure breed hens by using random regression model
Provedor de dados: 65
Autores: Ferreira,Priscila Becker; Rorato,Paulo Roberto Nogara; Breda,Fernanda Cristina; Michelotti,Vanessa Tomazetti; Rosa,Alexandre Pires; Macedo,André.
ABSTRACT: This study aimed to test different genotypic and residual covariance matrix structures in random regression models to model the egg production of Barred Plymouth Rock and White Plymouth Rock hens aged between 5 and 12 months. In addition, we estimated broad-sense heritability, and environmental and genotypic correlations. Six random regression models were evaluated, and for each model, 12 genotypic and residual matrix structures were tested. The random regression model with linear intercept and unstructured covariance (UN) for a matrix of random effects and unstructured correlation (UNR) for residual matrix adequately model the egg production curve of hens of the two study breeds. Genotypic correlations ranged from 0.15 (between age of 5 and 12...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barred Plymouth Rock; Heritability; Laying rate; White Plymouth Rock.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000500652

Genetic analysis of residual feed intake adjusted for fat and carcass and performance traits in a Nellore herd
Provedor de dados: 65
Autores: Moraes,Giovanna Faria de; Abreu,Luiza Rodrigues Alves; Ferreira,Isabel Cristina; Pereira,Idalmo Garcia.
ABSTRACT: The study of the genetic evaluation of residual feed intake adjusted for fat (RFIFat) is important for the appropriate use of feed efficiency in selection programs. The objective was to analyze the influence of selection for RFIF at on carcass and performance traits by estimating various genetic parameters. Data were analyzed from five tests of feed efficiency, which were conducted with 677 Nellore males. Genetic evaluation was performed by Bayesian inference using an animal model via single- and two-trait analyses. Variables analyzed were dry matter intake, average daily gain, RFIFat, rib eye area, back fat thickness, rump fat thickness, marbling score, and subcutaneous fat thickness. The posterior mean distributions estimated at each analysis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Back fat thickness; Feed efficiency; Genetic correlation; Heritability.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000200651

Genetic parameters in agronomic characters for selection of superior lineages of Ricinus communis L
Provedor de dados: 65
Autores: Santos,Laurenice Araujo dos; Silva,Simone Alves; Souza,Deoclides Ricardo de; Araujo,Gilmara de Melo; Almeida,Vanessa de Oliveira; Neves,Cláudia Garcia.
ABSTRACT: Knowledge on the variability and heritability of agronomic characters of interest aid the selection of superior materials. Thus, the objective of this study was to evaluate the genetic parameters of agronomic traits in castor bean plant lineages and to quantify the genetic correlations between them. The study was performed in the experimental area of the Federal University of the Recôncavo da Bahia, Cruz das Almas, Bahia. Seed oil content, vegetative cycle, plant height, and the number and weight of seeds per plant were evaluated in 47 lineages of castor bean seedlings. The coefficient of genetic variation was higher for weight of seeds per plant, revealing greater variability. The broad-sense heritability of individual plots presented a higher...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Castor bean plant; Genetic correlation; Heritability; Genetic improvement.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000100400

Genetic variation and correlation of agronomic traits in meadow bromegrass (Bromus riparius Rehm) clones
Provedor de dados: 65
Autores: Araújo,Marcelo Renato Alves de; Coulman,Bruce.
Meadow bromegrass (Bromus riparius Rehm.) is a recently introduced pasture grass in western Canada. Its leafy production and rapid regrowth have made it a major grass species for pasturing beef animals in this region. As relatively little breeding work has been done on this species, there is little information on its breeding behaviour. The main objective of this study was to estimate total genetic variability, broad-sense heritability, phenotypic and genetic correlations. Forty-four meadow bromegrass clones were evaluated for agronomic characters. Genetic variation for dry matter yield, seed yield, fertility index, harvest index, plant height, plant spread, crude protein, neutral detergent fiber and acid detergent fiber, was significant. Broad-sense...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Perennial grasses; Heritability; Phenotypic correlation; Genotypic correlation.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000200026

Genetic parameters and combined selection for phosphorus, phytate, iron, and zinc in Mesoamerican common bean lines
Provedor de dados: 64
Autores: Ribeiro,Nerinéia Dalfollo; Steckling,Skarlet De Marco; Mezzomo,Henrique Caletti; Somavilla,Iuri Paulo.
ABSTRACT The development of common bean cultivars that contain satisfactory minerals and phytate concentrations for the different nutritional requirements of consumers is a new strategy of breeding programs. This work aimed to obtain estimates of genetic parameters for the concentrations of phosphorus, phytate, iron, and zinc in a recombinant inbred line (RIL) population of Mesoamerican common bean, to study the correlations between these traits, and to select common bean lines for the biofortification program and for diets that require the decrease in the intake of these minerals. The RIL were obtained from the cross between BRS Esteio and SCS 205 Riqueza. Genetic variability and transgressive segregation were detected for all traits evaluated....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Heritability; Inheritance pattern; Pearson’s correlation; Selection index.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100209

Variability and genetic diversity study in an advanced segregating population of rice with bacterial blight resistance genes introgressed
Provedor de dados: 64
Autores: Govintharaj,Ponnaiah; Manonmani,Swaminathan; Robin,Sabariappan.
ABSTRACT Bacterial blight disease of rice caused by Xanthomonas oryzae pv. oryzae is one of the most important widespread disease around the globe and can cause severe yield reductions of up to 30% of the total yield. Genetic variability was studied in 54 families of CB 174 R × IRBB 60 rice with bacterial blight resistance genes introgressed at the Department of Rice, Tamil Nadu Agricultural University, Coimbatore, India. Traits such as plant height and the number of productive tillers per plant were found to have negative skewness in this study, indicating the duplication of gene effects. Panicle length and the number of grains per panicle were found to have positive kurtosis, indicating gene interactions. The phenotypic coefficient of variation was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rice breeding; Heritability; Principal component analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000300291

Phenotypic parameters of macromineral and phenolic compound concentrations and selection of Andean bean lines with nutritional and functional properties
Provedor de dados: 64
Autores: Ribeiro,Nerinéia Dalfollo; Mezzomo,Henrique Caletti.
ABSTRACT The development of Andean common bean lines that contain high macromineral concentration and a phenolic compound concentration that meets the consumer’s dietary requirements is unprecedented in the literature. The objectives of this study were to obtain estimates of phenotypic parameters for the macromineral and phenolic compound concentrations in a recombinant inbred line (RIL) population of Andean beans and to select lines with nutritional and functional properties. The RIL was obtained from a cross between cultivars Hooter and Cal 96. The lines in the F5:6 and F5:7 generations and the cultivars were evaluated in two consecutive experiments in the same experimental area. The concentrations of potassium (K), phosphorus (P), magnesium (Mg), and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phaseolus vulgaris; Heritability; Inheritance pattern; Selection index.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100210