Análise dos índices de classificação de bovinos avaliados em provas de ganho em peso, em confinamento
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Data
2011-02-15
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Universidade Federal de Goiás
Resumo
Weight gain performance trials (PGP) in feedlot evaluate the weight gain capacity
of the animals, making possible the selection based on phenotypical information.
Animals are classified based on pondered indexes for productive traits as average
daily weight gain, final weight, type or morphological evaluation, scrotal perimeter,
ribeye area and fat thickness. Using data from the Brazilian Association of Zebu
Breeders (ABCZ), the aim of this study was to evaluate classification indexes of
weight gain performance tests applied to Nellore cattle in feedlot, and to estimate
the variance components and the genetic correlations among the traits that
compose such indexes. Covariance components and genetic parameters were
estimated by the animal model commonly applied in the Restricted Maximum
Likelihood Model (REML), using MTDFREML software. Heritability estimates for all
traits were medium to high. Genetic correlation estimates were low regarding final
weight and average daily weight gain, scrotal perimeter and carcass traits. Final
weight, ribeye area, average daily weight gain and fat thickness were considered
medium. Therefore, major genetic gain can be obtained when using selection
indexes aimed at final weight
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Citação
MARQUES, Ednira Gleida. Analysis of the classification indexes of cattle valued
evidence of weight gain in feedlot. 2011. 78 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2011.