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Genetic correlations between mature cow weight and productive and reproductive traits in Nellore cattle

2012; Research Foundation of Ribeirão Preto; Volume: 11; Issue: 3 Linguagem: Inglês

10.4238/2012.may.10.4

1676-5680

Caio V. Regatieri, Arione Augusti Boligon, Fernando Baldi, Lúcia Galvão de Albuquerque,

Effects of Environmental Stressors on Livestock

We investigated genetic associations between mature cow weight (MW) and weaning weight (WW), yearling weight (YW), weight gain from birth to weaning (GBW), weight gain from weaning to yearling (GWY), weaning hip height (WHH), yearling hip height (YHH), scrotal circumference (SC), and age at first calving (AFC).Data from 127,104 Nellore animals born between 1993 and 2006, belonging to Agropecuária Jacarezinho Ltda., were analyzed.(Co)variance components were obtained by the restricted maximum likelihood method, applying an animal model in a multi-traits analysis.The model included direct genetic and residual effects as random effects, the fixed effects of contemporary group, and the linear and quadratic effects of animal age at recording (except for AFC, GBW, and GWY) and age of cow at calving as covariates (except for MW).The numbers of days from birth to weaning and from weaning to yearling were included as covariates for GBW and GWY, respectively.Estimated direct heritabilities were 0.43 ± 0.02 (MW), 0.33 ± 0.01 (WW), 0.36 ± 0.01 (YW), 0.28 ± 0.02 (GBW), 0.31 ± 0.01 (GWY), 0.44 ± 0.02 (WHH), 0.48 ± 0.02 (YHH), 0.44 ± 0.01 (SC), and 0.16 ± 0.03 (AFC).Genetic ©FUNPEC-RP www.funpecrp.com.