Consulta: subjectFacets:"Genetic correlation"
Registros recuperados: 61
Data/hora: 01/06/2024 02:29:43

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

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

Age-age correlation for early selection of rubber tree genotypes in São Paulo State, Brazil
Provedor de dados: 74
Autores: Gonçalves,Paulo de Souza; Bortoletto,Nelson; Cardinal,Átila Bento Beleti; Gouvêa,Lígia Regina Lima; Costa,Reginaldo Brito da; Moraes,Mário Luiz Teixeira de.
In a field trial involving 68 rubber tree (Hevea spp.) clones calculation of genotypic correlation coefficients revealed significant age-age correlation from age 1 to 6 (immature period) for girth A and for age 7 to 12 (mature period) for girth B and for age 7 to 12 (production of latex) for yield. Rank correlation coefficients between all immature ages of girth (girth A), all ages of mature girth (girth B) and all annual rubber production (yield) were significant for the three traits, with the coefficients decreasing with increasing age. Selection of the sets of best 30, 15, 10 and 5 clones from the available 68 clones at a given age was generally accompanied by a descending order of percentage success. It was suggested: (a) to have the best 30 clones of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Early clonal multiplication; Genetic correlation; Rank correlation; Evaluation of clones.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000500018

Genetic parameters and relationships between growth traits and scrotal circumference measured at different ages in Nellore cattle
Provedor de dados: 74
Autores: Boligon,Arione Augusti; Baldi,Fernando; Albuquerque,Lucia Galvão de.
Records from 106,212 Nellore animals, born between 1998 and 2006, were used to estimate (co)variance components and genetic parameters for birth weight (BW), average weight gains from birth to weaning (GBW), average weight gains from weaning to after yearling (GWAY), weaning hip height (WHH), postweaning hip height (PHH) and scrotal circumferences at 9 (SC9), 12 (SC12) and 15 (SC15) months of age. (Co)variance components were estimated by an animal model using multi-trait analysis. Heritability estimates for BW, GBW, GWAY, WHH, PHH, SC9, SC12 and SC15 were 0.31 ± 0.01; 0.25 ± 0.02; 0.30 ± 0.04; 0.51 ± 0.04; 0.54 ± 0.04; 0.39 ± 0.01; 0.41 ± 0.01 and 0.44 ± 0.02, respectively. Genetic correlations between growth traits ranged from 0.09 ± 0.01 to 0.88 ± 0.01,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Genetic correlation; Hip height; Average weight gain.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000200010

Genetic parameters for body weight, carcass chemical composition and yield in a broiler-layer cross developed for QTL mapping
Provedor de dados: 74
Autores: Nunes,Beatriz do Nascimento; Ramos,Salvador Boccaletti; Savegnago,Rodrigo Pelicioni; Ledur,Mônica Corrêa; Nones,Kátia; Klein,Claudete Hara; Munari,Danísio Prado.
The objective of this study was to estimate genetic and phenotypic correlations of body weight at 6 weeks of age (BW6), as well as final carcass yield, and moisture, protein, fat and ash contents, using data from 3,422 F2 chickens originated from reciprocal cross between a broiler and a layer line. Variance components were estimated by the REML method, using animal models for evaluating random additive genetic and fixed contemporary group (sex, hatch and genetic group) effects. The heritability estimates (h²) for BW6, carcass yield and percentage of carcass moisture were 0.31 ± 0.07, 0.20 ± 0.05 and 0.33 ± 0.07, respectively. The h² for the percentages of protein, fat and ash on a dry matter basis were 0.48 ± 0.09, 0.55 ± 0.10 and 0.36 ± 0.08,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broiler; Carcass composition; Genetic correlation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000300011

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

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

Phenotypic plasticity of Myzus persicae (Hemíptera: Aphididae) raised on Brassica oleracea L. var. acephala (kale) and Raphanus sativus L. (radish)
Provedor de dados: 74
Autores: Peppe,Fernanda Borja; Lomônaco,Cecília.
The study of variability generated by phenotypic plasticity is crucial for predicting evolutionary patterns in insect-plant systems. Given sufficient variation for plasticity, host race formation can be favored and maintained, even simpatrically. The plasticity of size and performance (assessed by the lifetime fitness index r m) of six clones of Myzus persicae was tested, with replicates allowed to develop on two hosts, kale (Brassica oleracea var. acephala) and radish (Raphanus sativus). The clones showed significant variability in their plasticity. Reaction norms varied through generations and negative genetic correlation, although not significant, tend to increase with the duration of host use. The lack of plasticity in lifetime fitness among generalist...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quantitative genetics; Genetic correlation; Morphological plasticity; Phenotypic correlation; Physiological plasticity; Trade-offs.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000200012

Genotype by environment interaction in Nelore cattle from five Brazilian states
Provedor de dados: 74
Autores: Diaz,Iara Del Pilar Solar; Oliveira,Henrique Nunes de; Bezerra,Luis Antônio Framartino; Lôbo,Raysildo Barbosa.
Records from 75,941 Nelore cattle were used to determine the importance of genotype by environment interaction (GEI) in five Brazilian states. (Co)variance components were estimated by single-trait analysis (with yearling weight, W450, considered to be the same trait in all states) and multiple-trait analysis (with the record from each state considered to be a different trait). The direct heritability estimates for yearling weight were 0.51, 0.39, 0.44, 0.37 and 0.41 in the states of Goiás, Mato Grosso, São Paulo, Mato Grosso do Sul and Minas Gerais, respectively. The across-state genetic correlation estimates between Goiás and Mato Grosso, Goiás and Minas Gerais, São Paulo and Minas Gerais, and Mato Grosso do Sul and Minas Gerais ranged from 0.67 to 0.75....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian inference; Beef cattle; Genetic correlation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000300012

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

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

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

Genotype by diet interactions in European sea bass (Dicentrarchus labrax L.): Nutritional challenge with totally plant-based diets
Provedor de dados: 5
Autores: Le Boucher, Richard; Vandeputte, Marc; Dupont-nivet, M.; Quillet, E.; Ruelle, Francois; Vergnet, Alain; Kaushik, Sadasivam; Allamellou, J. M.; Medale, F.; Chatain, Beatrice.
Aquaculture of carnivorous species has strongly relied on fish meal and fish oil for feed formulation; however, greater replacement by terrestrial plant-based products is occurring now. This rapid change in dietary environment has been a major revolution and has to be taken into consideration in breeding programs. The present study analyzes potential consequences of this nutritional tendency for selective breeding by estimating genetic parameters of BW and growth rates estimated by the thermal growth coefficient (TGC) over different periods with extremely different diets. European sea bass (Dicentrarchus labrax L.) from a factorial cross (1,526 fish) between 25 sires and 9 dams were used to estimate heritabilities and genotype by diet interaction. Starting...
Tipo: Text
Palavras-chave: European sea bass; Genetic correlation; Genotype by diet interaction; Genotype by environment interaction; Plant-based diet.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00146/25711/26299.pdf

A first insight into genotype x diet interactions in European sea bass (Dicentrarchus labrax L. 1756) in the context of plant-based diet use
Provedor de dados: 5
Autores: Le Boucher, Richard; Vandeputte, Marc; Dupont-nivet, Mathilde; Quillet, Edwige; Mazurais, David; Robin, Jean; Vergnet, Alain; Medale, Francoise; Kaushik, Sadasivam; Chatain, Beatrice.
This preliminary study assessed genotype x diet interaction in late growth of European sea bass (Dicentrarchus labrax) fed with either a fish meal (FM)- or a fish oil (FO)-based diet (M) or an all-plant-based (PB) diet. A total of 550 fish from 224 families were reared together and tagged. DNA was sampled and microsatellites were used to assign parentage. When fish weight was 192 +/- 54 g, two tanks were fed with M (FM: 100%; FO: 100%) and two others with PB (FM: 0% and FO: 0%). Body weight (BW), fork length (FL) and fillet lipid content (CorrFat) were analysed with a linear model and with REML methodology. We observed no significant differences between groups, but a slightly lower (P=0.03) daily growth coefficient in sea bass fed PB than in those fed M....
Tipo: Text
Palavras-chave: Genotype by diet x environment interaction; European sea bass; Plant diet; Genetic correlation.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00032/14335/12374.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

Relationships among agronomic traits and seed yield in pea
Provedor de dados: 46
Autores: Espósito,María Andrea; Martin,Eugenia Alejandra; Cravero,Vanina Pamela; Liberatti,David; López Anido,Fernando Sebastián; Cointry,Enrique Luis.
The evaluation of selection criteria using correlation coefficients, multiple regression and path analysis was carried out for a period of two years on forty pea genotypes. The correlation analysis revealed that grain yield had genotypic relationships with numbers of pods, seeds per plot, length of the internodes and plant height in 2007 and also with grain diameter, length and width of leaflets and number of nodes at the first pod in 2008. The highest positive direct effects in 2007 were length of the internodes (0.68), seeds per plot (0.38) and numbers of pods (0.26). Length leaflets exhibited a negative direct effect (-0.46). The highest positive indirect contribution of plant height mediated by length of the internodes was 0.50. The highest negative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pisum sativum L.; Yield components; Genetic correlation; Stepwise regression; Path coefficient.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332009000100001

Effects of heat stress on production, somatic cell score and conception rate in Holsteins
Provedor de dados: 19
Autores: Hagiya, Koichi; Hayasaka, Kiyoshi; Yamazaki, Takeshi; Shirai, Tatsuo; Osawa, Takefumi; Terawaki, Yoshinori; Nagamine, Yoshitaka; Masuda, Yutaka; Suzuki, Mitsuyoshi.
We examined the effects of heat stress (HS) on production traits, somatic cell score (SCS) and conception rate at first insemination (CR) in Holsteins in Japan. We used a total of 228242 records of milk, fat and protein yields, and SCS for the first three lactations, as well as of CR in heifers and in first- and second-lactation cows that had calved for the first time between 2000 and 2012. Records from 47 prefectural weather stations throughout Japan were used to calculate the temperature-humidity index (THI); areas were categorized into three regional groups: no HS (THI&lt;72), mild HS (72THI&lt;79), and moderate HS (THI79). Trait records from the three HS-region groups were treated as three different traits and trivariate animal models were used. The...
Palavras-chave: Genetic correlation; Heat-stress; Holsteins; Temperature-humidity index (THI).
Ano: 2017
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4575

Genetic Correlations of Milk Production and Type Traits with Somatic Cell Score from 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および(社)日本ホルスタイン登録協会北海道支局の体型記録を用い，体細胞スコアと泌乳形質および体型形質との遺伝相関を推定した．各体型形質の記録数は審査開始時期の違いにより異なるが，多くの形質に共通な記録数を示すと，初産が181,291記録であり，2産が104,105記録，3産が30,973記録であった．遺伝相関の推定には，2形質分析モデルを用いた．母数効果としては，体細胞に対して，牛群・検定日，分娩月齢，分娩後日数の1次の回帰，分娩後日数に対するWilminkの指数項，体型形質に対しては，牛群・審査日，審査時月齢，泌乳ステージ，審査員の各効果を考慮し，さらに変量効果として両形質について，相加的遺伝効果と残差を含むモデルを用いた．体細胞スコアと乳生産形質との遺伝相関は−0.22〜0.15と低い値が推定され，初産において正の相関，2産以降では負の相関となる傾向が示された．体型形質と体細胞スコアとの遺伝相関は，産次により値が変動し，正負の符号の逆転が認められた．これは，加齢による体型変化に起因していると考えられる．体型形質の中で，乳房の深さ（−0.29〜−0.19）および前乳房の付着（−0.25〜−0.07）において，負の遺伝相関が推定された．これらの体型形質は生涯生産性，在群期間とも遺伝的な関連があり，これらの体型形質を改良することにより，体細胞スコアを低減することが可能であり，結果として生涯生産量の増加が期待できる．
Palavras-chave: Somatic cell score; Genetic correlation; Type trait; Milk production; Holstein.
Ano: 2005
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2597

Genetic relationships of age at first calving, and reproductive traits of cows and yield traits for Holsteins in Hokkaido
Provedor de dados: 19
Autores: 阿部, 隼人; 増田, 豊; 鈴木, 三義; MASUDA, Yutaka; SUZUKI, Mitsuyoshi.
初産分娩月齢と3産までの経産牛繁殖形質ならびに生産形質間について，AIREML法を用いた2形質アニマルモデルにより，遺伝的パラメータを推定した．記録は，(社)北海道酪農検定検査協会に集積された繁殖ならびに乳期記録，および(社)日本ホルスタイン登録協会北海道支局に集積された血統記録である．計算機の能力の制約からすべての記録を同時に分析することは困難であったため，牛群単位の無作為抽出により10万記録程度のサブセットを10個生成し，各サブセットに対し分析を行なった．遺伝率は，初産分娩月齢に対し0.22，経産牛繁殖形質に対し0.03～0.05と推定された．初産分娩月齢と経産牛繁殖形質との遺伝相関は絶対値で0.2を上回らなかった一方，生産形質との遺伝相関は2産以降で－0.3から－0.4と比較的高かった．2産以降の生産形質との好ましい関連から，初産分娩月齢の改良による長期的な生産性の向上の可能性が示された．
Palavras-chave: Age at first calving; Genetic correlation; Holstein; Reproductive traits of cows; Yield traits.
Ano: 2008
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3942

Experimental Design Efficiency and Test Ability on Erva-mate Genetic Improvement
Provedor de dados: 190
Autores: Sturion, José Alfredo; Resende, Marcos Deon Vilela de.
The perennial plant selection is based on individual genetic values predicted from phenotypic observations. The more adequate the control of environmental variability, the more accurate the prediction. This paper  aimed to investigate: 1) the test ability by using the  significance of Snedecor F test for block effects; 2) the  spatial variability within blocks by using the plot  intraclass correlation coefficient; 3) the experimental  design efficiency in terms of the local control, by using  the significance of Snedecor F test for block effects and  the plot intraclass correlation coefficient (c2),  simultaneously; 4) the genotype x environmental  interaction within site, by using the genetic correlation coefficient across replications. The used data...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spatial variability; Genetic correlation; Plot intraclass correlation coefficient Variabilidade espacial; Correlação genética; Coeficiente de correlação intraclasse na parcela.
Ano: 2011
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/236

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

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

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

Early selection and classification of yerba mate progênies
Provedor de dados: 86
Autores: Wendling,Ivar; Sturion,José Alfredo; Stuepp,Carlos André; Reis,Cristiane Aparecida Fioravante; Ramalho,Magno Antonio Patto; Resende,Marcos Deon Vilela de.
Abstract: The objective of this work was to evaluate the feasibility of early selection of open-pollinated yerba mate (Ilex paraguariensis) progenies, and to classify the best parents and candidates for clones. The germplasm is composed of 140 progenies collected from areas within the natural distribution of the species in Southern Brazil and a commercial genotype (control). The experiment was established in Ivaí, in the state of Paraná, Brazil, in March 1997, in randomized complete blocks, with ten replicates, and linear plots of six plants. The commercial mass (kg per plant) of leaves and branches smaller than 7 mm was harvested at 2.5, 4.5, 6.5, and 18.7 years of age. The statistical evaluation was performed using the mixed model procedure with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ilex paraguariensis; Cloning; Genetic correlation; Progeny x harvesting-age interaction.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000300279

Genotype × country interaction for weaning weight in the Angus populations of Brazil and Uruguay
Provedor de dados: 96
Autores: Espasandin,Ana Carolina; Urioste,Jorge Ignacio; Campos,Leonardo Talavera; Alencar,Maurício Mello de.
It was analyzed the existence of genotype × environment interaction for weaning weight in populations of Angus from Brazil and Uruguay by using records of 73,205 animals (10,257 from Uruguay and 62,948 from Brazil) belonging to 33 and 161 farms and 13 and 34 regions in Uruguay and Brazil, respectively. It was used the one- and two-trait animal model analyses considering weight at weaning of each country as different characters. Coefficients of direct and maternal additive-genetic correlation estimated by two statistical models (including or not bull × country effect) Models included the fixed effects of contemporary group (herd-year and month of birth), sex of the calf, the covariates age of dam at calving (years) and age of calf at weaning (days), and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Genetic correlation; Genotype × environment interaction; International evaluation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000300014

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

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 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 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

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 assessment of seed yield-related traits in superior hybrids of Paspalum plicatulum × Paspalum guenoarum
Provedor de dados: 96
Autores: Lopes,Rodrigo Ramos; Franke,Lucia Brandão; Souza,Cleber Henrique Lopes de; Bertoncelli,Patricia; Graminho,Larissa Arnhold; Ávila,Mariana Rockenbach de; Pereira,Emerson André; Motta,Eder Alexandre Minski da.
ABSTRACT This study aimed to estimate the genetic parameters, genetic correlations, genetic dissimilarity, and predicted gains with the selection of interspecific apomictic Paspalum plicatulum × Paspalum guenoarum hybrids in relation to seed yield traits. Nineteen genotypes that showed increased forage yield in previous studies were planted in a randomized complete block design with ten blocks. Traits evaluated in this study were: number of tillers/plant, number of reproductive tillers/plant, number of racemes/inflorescence, number of seeds/inflorescence, weight of a thousand seeds, and seed yield. Data were analyzed using a mixed model approach. The genotypes evaluated in our study showed improvement potential in relation to high heritability      (H a 2...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clustering analysis; Genetic correlation; Genetic gains; Genetic parameters; REML/BLUP.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100402

Selection for higher body weight in Nelore cattle is effective in achieving an increase of longissimus muscle area without reducing subcutaneous fat thickness
Provedor de dados: 96
Autores: Pinheiro,Tiago Roque; Mercadante,Maria Eugênia Zerlotti; Albuquerque,Lucia Galvão de; Bonilha,Sarah Figueiredo Martins; Monteiro,Fábio Morato.
The objectives of this study were to estimate heritabilities and genetic and phenotypic correlations between carcass traits measured by ultrasound and other economically important traits generally used as selection criteria in beef cattle and to estimate the genetic changes in the carcass traits as a result of selection for post-yearling weight. Carcass traits measured by ultrasound at two ages (12 and 18 months) and the correlation of these traits with weight, hip height and body condition score of males (yearling) and females (post-yearling) were analyzed. Multi-trait analysis was performed using the restricted maximum likelihood method under an animal model. To demonstrate the effect of selection for growth, phenotypic and expected breeding value means...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass traits; Correlated responses; Genetic correlation; Ultrasound; Zebu cattle.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000600016

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 analysis of visual scores and their relationships to mature female weight in Nellore breed
Provedor de dados: 96
Autores: Regatieri,Inaê Cristina; Boligon,Arione Augusti; Albuquerque,Lucia Galvão de.
Data from 79,884 Nellore breed animals were used to estimate genetic parameters and to evaluate the relationships among scores of conformation, precocity and musculature obtained at weaning and after yearling ages and weight of mature females. It was used the restricted maximum likelihood method in a multi-trait analysis with the model that included direct additive genetic and residual effects, as random effects, and the fixed effects of contemporary group and, as covariables, animal age at weighing and age of dam at calving (except for weight of females at adult age). Contemporary groups at weaning were defined by the variables: sex, herd, year and month of birth, and management group at birth and weaning. For definition of contemporary group at yearling,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Conformation; Genetic correlation; Musculature; Precocity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000100014

Genetic parameters and genetic and phenotypic trends of performance traits of equines from the Brazilian Army
Provedor de dados: 96
Autores: Dornelles,Mariana de Almeida; Araújo,Ronyere Olegário de; Everling,Dionéia Magda; Weber,Tomás; Lopes,Jader Silva; Pacheco,Paulo Santana; Breda,Fernanda Cristina; Rorato,Paulo Roberto Nogara.
The objective of this research was to compare the magnitude of genetic parameters (coefficients of heritability and genetic correlation) as estimated by the Restricted Maximum Likelihood (REML) method and Bayesian Inference, and to estimate the genetic and phenotypic trends to the traits height at the withers (HW24) and weight at 24 months of age (W24). The average heritability estimated by Bayesian Inference to HW24 was 0.47, and it was lower than that obtained by REML bi-trait analysis (0.52); however, the value estimated to W24 (0.39) was higher than that obtained by REML bi-trait analysis (0.38). The genetic correlation estimate between W24 and HW24 traits obtained by the REML method (0.66) was lower than that obtained by the Bayesian Inference Method...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Genetic progress; Variance components.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000600015

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

Genotype by environment interaction in different birth seasons for weight at 240, 365 and 450 days of age in Tabapuã cattle
Provedor de dados: 96
Autores: Sousa Júnior,Severino Cavalcante de; Diaz,Iara Del Pilar Solar; Santos,Karina Rodrigues dos; Sousa,José Ernandes Rufino de; Sarmento,José Lindenberg Rocha; Martins Filho,Raimundo.
The objective of this study was to evaluate the effect of genotype by environment interaction (GEI) on the weight of Tabapuã cattle at 240 (W240), 365 (W365) and 450 (W450) days of age. In total, 35,732 records of 8,458 Tabapuã animals which were born in the state of Bahia, Brazil, from 1975 to 2001, from 167 sires and 3,707 dams, were used. Two birth seasons were tested as for the environment effect: the dry (D) and rainy (R) ones. The covariance components were obtained by a multiple-trait analysis using Bayesian inference, in which each trait was considered as being different in each season. Covariance components were estimated by software gibbs2f90. As for W240, the model was comprised of contemporary groups and cow age (in classes) as fixed effects;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian inference; Beef cattle; Genetic correlation; Multiple-trait analysis.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001000005

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

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

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

Inferences on the effects of selection for feed conversion over meat quality traits in broiler
Provedor de dados: 63
Autores: Paiva,José Teodoro de; Mourão,Gerson Barreto; Ferraz,José Bento Sterman; Mattos,Elisângela Chicaroni; Michelan Filho,Tércio; Campos,Bárbara Machado; Eler,Joanir Pereira; Gaya,Leila de Genova.
ABSTRACT: The intense selection process for economic traits conducted by the poultry breeding programs has been caused several changes in broiler meat quality. A database belonging to a selection program of a broiler male line was used to estimate heritability and genetic correlations for feed conversion ratio and meat quality traits, which were: initial and final pH, lightness, drip loss, thawing loss and shear force. Two-trait analyses were performed and the components of co(variance) and genetic parameters were determined using the Bayesian approach and the GIBBS3F90 software. The heritability estimate found for feed conversion ratio (0.52) showed high influence of direct additive genetic effects on the expression of this trait; therefore, this trait is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayesian inference; Animal breeding; Genetic correlation; Indirect selection.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000200129

Genetic association between longevity and linear type traits of Holstein cows
Provedor de dados: 63
Autores: Kern,Elisandra Lurdes; Cobuci,Jaime Araujo; Costa,Cláudio Napolis; McManus,Concepta Margaret; Braccini Neto,José.
Longevity is a desirable trait in the dairy industry because of its relationship to profitability. The aim of this study was to estimate genetic parameters for longevity measurements related to productive life, or life in the herd, and linear type traits of Brazilian Holstein cows born between the years 1990 and 2008. The (co) variance components were estimated by the restricted maximum likelihood method. The heritability for measurements of longevity and linear type traits ranged from 0.05 to 0.07 and 0.08 to 0.39, respectively. The genetic correlations between measurements of longevity and linear type traits ranged from -0.39 to 0.31. Direct selection for longevity does not necessarily lead to long-lived cows, due to low heritability. Indirect genetic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic correlation; Mammary system; Productive life; Rear teat placement.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000300203

Genetic correlation between traits in the ESALQ-PB1 maize population divergently selected for tassel size and ear height
Provedor de dados: 63
Autores: Farias Neto,Austeclínio Lopes; Miranda Filho,José Branco de.
Full-sib and selfed (S1) progenies were obtained from sub-populations of ESALQ-PB1, divergently selected for tassel size (T+ and T-) and ear height (E+ and E-), and used for estimating genetic and phenotypic correlation coefficients between traits. The analyzed traits were: EW- total ear weight (g/plant), PH- plant height (cm), EH- ear height (cm), TB- tassel branch number and TL- tassel length. The highest genetic (rG) and phenotypic (rF) correlation was observed for the combination PH x EH, as expected, with average of 0.800 and 0.778, respectively over sub-populations and locations. It is apparent that divergent selection for tassel size did not affect greatly the correlation between PH and EH in the full sib progenies, but in the inbred progenies the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Genetic correlation; Divergent selection; Tassel size; Ear height.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100018

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

Avaliação genética do ganho de peso e conversão alimentar de coelhos da raça Nova Zelândia Branco criados em ambientes diferenciados - DOI: 10.4025/actascianimsci.v32i1.6262
Provedor de dados: 2
Autores: Santos, Alexandre Leseur; UEM; Scapinello, Cláudio; UEM; Martins, Elias Nunes; UEM; Granzotto, Fernanda; UEM; Paula, Meybi Carneiro; UEM; Hidalgo, André Marubayashi; UEM.
O objetivo do presente trabalho foi avaliar se a seleção para conversão alimentar (CA) e ganho de peso (GP), com base no desempenho individual e ou coletivo dos láparos, pode produzir ganhos genéticos em progênies criadas coletivamente, e animais submetidos à avaliação no período de 50 a 70 dias de idade, utilizando inferência Bayesiana. Realizaram-se seis análises bicaráter. No teste de desempenho foi observado que as características ganho de peso e conversão alimentar em ambos os ambientes tiveram valores para herdabilidade que variam de 0,42 a 0,60. Tanto a correlação genética 0,44 a 0,68 (GP) e 0,23 a 0,56 (CA) como a fenotípica 0,30 (GP) e 0,17 (CA) foram positivas para a mesma característica quando avaliada nos dois ambientes, coletivo ou individual,...
Tipo: Pesquisa de Campo; Metodologia
Palavras-chave: 5.04.02.00-5; Herdabilidade; Ganho de peso; Conversão alimentar; Correlação genética; Inferência bayesiana GENÉTICA E MELHORAMENTO DOS ANIMAIS DOMÉSTICOS Heritability; Weight gain; Feed conversion; Genetic correlation; Bayesian inference.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/6262

Influence of genotype-environment interaction on the classification of Nellore bulls in Southern Brazil
Provedor de dados: 2
Autores: Bresolin, Tiago; Everling, Dionéia Magda; Rorato, Paulo Roberto Nogara; Braz, Camila Urbano; Breda, Fernanda Cristina.
The aim of this study was to assess the occurrence of genotype-environment interaction, as well as its effects on the magnitude of genetic parameters and the classification of Nellore breeding bulls for the trait adjusted weight at 205 days (W205) on Southern Brazil. The components of (co)variance were estimated by Bayesian inference, using a linear-linear animal model in a bi-trait analysis. The proposed model for the analyses considers as random the direct additive genetic and maternal effects and residual effects, and as fixed effects the contemporary groups, sex, season of birth and weighing, and calving age as covariable  (linear and quadratic effects). The a posteriori mean estimates of the direct heritabilities for W205 in the three States varied...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Variance components; Genetic correlation; Bayesian inference; Genetic parameters.
Ano: 2015
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/23602

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 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

Phenotypic variance of black oat growing in crop seasons reveals genetic effects predominance
Provedor de dados: 42
Autores: MEIRA,DANIELA; MEIER,CARINE; OLIVOTO,TIAGO; NARDINO,MAICON; RIGATTI,ALEXSANDER; KLEIN,LUÍS ANTÔNIO; CARON,BRAULIO O.; MARCHIORO,VOLMIR S.; SOUZA,VELCI Q. DE.
Abstract: This work aimed to determine variance components and genetic parameters, as well as phenotypic, genetic and environmental correlations among black oat (Avena strigosa) families grown in different crop season. Seventy-six black oat families and three controls (BRS Madrugada, BRS Centauro, BRS 139 Neblina) were evaluated in two crop seasons (2016 and 2017), using families with intercalary controls experimental design. The results reveled high potential of black oat families to compose a breeding program, due to families and controls variance were similar, variance components expressed greater genetic variance origin for crop season. Panicle weight and panicle grain weight presented high heritability and, these are correlated with panicle length....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avena strigosa; Genetic correlation; Genetic parameters; Plant breeding.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500864

Comparison of Phenotypic and Genetic Performance of Local Silkworm Groups and Two Commercial Lines
Provedor de dados: 48
Autores: Mirhosseini,Seyed Ziaeddin; Nematollahian,Shahla; Ghanipoor,Mani; Seidavi,Alireza.
Five Iranian native silkworm groups: Baghdad, Khorasan Orange, Guilan Orange, Khorasan Pink, Khorasan Lemon, and 107 and 110 commercial lines (12 families from each breed) were randomly selected and reared during 2003-2005 (five generations in spring and autumn). In each family, 30 male and 30 female cocoons were individually recorded for weight, shell weight and shell ratio. From among the native groups, the highest average in all three traits belonged to Baghdad and Khorasan Pink, and the lowest to Khorasan Orange and Khorasan Lemon. From among the commercial lines, the highest average in all three traits belonged to 107. In comparing heritabihty for cocoon weight in native groups, the highest heritabihty belonged to Guilan Orange (0.5147) and Khorasan...
Tipo: Journal article
Palavras-chave: Native silkworm; Commercial lines; Bombyx mori L.; Heritabihty; Genetic correlation.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602010000400005

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

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