Genetic parameters for type traits in Holstein cows in Brazil

Revista Brasileira de Zootecnia

Rafael Viegas Campos²  Jaime Araujo Cobuci²  Claudio Napolis Costa¹  José Braccini Neto² 

[1] ,Universidade Federal do Rio Grande do Sul Departamento de Zootecnia

关键词: (co)variance components;    dairy cattle;    genetic correlations;    heritability;    REMLF90;    selection;   

DOI  :  10.1590/S1516-35982012001000003

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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