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| Registros recuperados: 177 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 177 | |
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