Utilização de diferentes metodologias para avaliação genética de bovinos de corte / Utilization of different methodologies for genetic evaluation of beef cattle

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

15/06/2011

RESUMO

With the constant changes in the beef cattle production system, and an even more demanding consumer market, the focus on the carcass yield and quality is increasing. For the slaughters claims to be met, the breeder needs a tool that can identify the bulls that will be, in fact, the improvers to those specific features. Therefore, this project aims to: (i) Estimate the variance and covariance components, and the genetic parameters for the muscle score trait in Nellore animals; (ii) Estimate the variance and covariance components, and the genetic parameters for the growth traits (birth weight, weaning weight, post-weaning gain) and reproductive traits (scrotal circumference) in Nellore animals; (iii) Estimate the correlation between muscle score, growth and reproductive traits; (iv) Compare methodologies that consider the weaning management group as fixed and random effects; (v) Compare uni, bi and multi-trait methodologies and evaluate the advantages to include in the animal breeding programs, by the correlated response, the muscle score trait; (vi) Estimate the EPD\ s for muscle score, growth and reproductive traits and (vii) Compare the multi-trait and bivariate methodologies in the genetic evaluation of bulls through the calculation of selection efficiency loss.

ASSUNTO(S)

avaliação de reprodutores bulls evaluation correlações genéticas genetic correlation herdabilidade heritability resposta à seleção selection response

ACESSO AO ARTIGO

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