avaliação genética de características de escores visuais de bovinos da raça nelore da desmama até a maturidade genetic evaluation of visual scores traits of nelore cattle from weaning to maturity
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Abstract
The objectives of this study were to estimate the genetic parameters of the following categorical traits: musculature, physical structure, racial breed aspects, conformation, navel, pigmentation and sacrum, and predict breeding values, using bayesian statistics under threshold animal models, considering different ages of cattle of the Nelore breed. The information concerning visual scores were obtained from 2000 to 2005 from cattle of the Nelore breed from thirteen participant farms of the Brazilian Nelore Program. In the two-trait analyses, 500,000 rounds up to 1,100,000 cycles were used to reach the convergence of the Gibbs chain. The burn-in and thinning interval were 100,000 and 1,000 cycles, respectively. The evaluated visual scores at the age of 8 and 22 months presented moderate heritability estimates, suggesting that these traits can be used to promote genetic gain by direct selection. The genetic correlations between the morphological traits of musculature, physical structure and conformation were moderate, indicating correlated responses between the traits. The use of the visual scores is recommended, as selection criteria, in at least two phases of the animal life, at weaning and yearling time.
| Reference Key |
faria2009revistaavaliao
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| Authors | ;Carina Ubirajara de Faria;Cláudio de Ulhôa Magnabosco;Lucia Galvão de Albuquerque;Luiz Antônio Framartino Bezerra;Raysildo Barbosa Lôbo |
| Journal | european journal of lipid science and technology |
| Year | 2009 |
| DOI |
10.1590/S1516-35982009000700005
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| URL | |
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