Genetic parameters for type traits in Holstein cows in Brazil

AUTOR(ES)

Campos, Rafael Viegas, Cobuci, Jaime Araujo, Costa, Claudio Napolis, Braccini Neto, José

FONTE

R. Bras. Zootec.

DATA DE PUBLICAÇÃO

2012-10

RESUMO

Data from 26,558 Holstein cows in 802 herds were used to estimate genetic, residual and phenotypic parameters for 22 type traits. The model included the fixed effects of herd-year, period of classification, classifier, stage of lactation and age of cows at calving (covariate) and random genetic and residual effects. Heritability for type traits ranged from 0.10 to 0.39. The genetic variability in these traits suggested the possibility for moderate genetic gains through selection. The phenotypic correlations were moderated, mainly in the section conformation. Genetic correlations between type traits ranged from -0.44 to 0.85. High genetic correlations indicated that breeding programs could be successful without including all type traits. The selection for the final score at the expense of other traits must be performed with restraint, because in the long term, this may promote undesirable changes in some type traits.

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