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| Viana,José Marcelo Soriano. |
| Although linkage disequilibrium, epistasis and inbreeding are common phenomena in genetic systems that control quantitative traits, theory development and analysis are very complex, especially when they are considered together. The objective of this study is to offer additional quantitative genetics theory to define and analyze, in relation to non-inbred cross pollinating populations, components of genotypic variance, heritabilities and predicted gains, assuming linkage disequilibrium and absence of epistasis. The genotypic variance and its components, additive and due to dominance genetic variances, are invariant over the generations only in regard to completely linked genes and to those in equilibrium. When the population is structured in half-sib... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Components of genotypic variance; Heritabilities; Half-sib families; Full-sib families. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000400021 |
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| Faria,Carina Ubirajara de; Magnabosco,Cláudio de Ulhôa; Reyes,Arcadio de los; Lôbo,Raysildo Barbosa; Bezerra,Luiz Antônio Framartino; Sainz,Roberto Daniel. |
| We used Gibbs sampling in single and two-trait animal models to estimate genetic parameters for some reproductive and related traits of Nellore cattle (Bos indicus). Female traits were age at first calving (AFC), cumulative productivity (CP) and adult weight (AW). For males, scrotal circumferences at 365 and 450 days of age were analyzed. Gibbs sampling using the Multiple Trait using Gibbs Sampling under Animal Model (MTGSAM) program of Van Tassel and Van Vleck was used to estimate the (co)variance components of the traits and conduct genetic analyses. Heritabilities were AFC = 0.26, AW = 0.36 and CP = 0.25 under the single-trait animal model. The mean, mode and median estimates for genetic parameters obtained from the marginal posterior distributions... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bayesian inference; Genetic parameters; Heritabilities; Nellore cattle; Reproductive traits. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000300008 |
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