Modelos bayesianos de limiar e linear na estimação de parâmetros genéticos para características morfológicas de bovinos da raça Nelore
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2010-09
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Resumo
It was aimed to compare the estimates of genetic
parameters for body structure, finishing precocity
and muscling obtained in single-trait and two-trait
bayesian analyses under linear and threshold
models. Visual scores obtained from 4,155 Nelore
cattle at yearling, belonging to the Brazilian Nelore
Program, were used. The animals were evaluated
visually by method SAM (System of Morphologic
Evaluation). Genetic parameters were estimated by
single-trait bayesian analysis considering linear
and threshold models (morphological traits) and
two-trait bayesian analysis considering linearlinear
and linear-threshold models (including the
weight to the 120 days). In single-trait analysis, it
was verified that heritability estimated were
similar for both the models. When considering
two-trait analysis, the heritability estimates
obtained in the linear-linear model had presented
greater magnitude than that in the linear-threshold
model. However, the Spearman correlations
among the breeding values for different models (linear or threshold and linear-linear or linearthreshold)
showed low alteration in the placement
of the animals, and it was an insufficient
modification to alter their classification as for the
percentile, in other words, all the animals TOP1%,
when linear models were used, continued being
TOP1% when used threshold models. In the
genetic evaluation of animals for morphological
traits, the linear or threshold model can be used in
genetic improvement programs.
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Bovinos de corte, Escores visuais, Inferência bayesiana, Bayesian inference, Beef cattle, Visual scores
Citação
PIRES, Bruno Carlos et al. Modelos bayesianos de limiar e linear na estimação de parâmetros genéticos para características morfológicas de bovinos da raça Nelore. Revista Brasileira de Saúde e Produção Animal, Salvador, v. 11, n. 3, p. 651-661, jul./set. 2010.