Abstract
Heritabilities and genetic correlations between birth weight (n = 13,741), adjusted 240-day weaning weight (WW, n = 8,806) and age at first calving (AFC, n = 3,955) of Brown Swiss cattle in Mexico were estimated. Data from 91 herds located in 19 of 32 states of Mexico from 1982 to 2006 were provided by the Mexican Brown cattle Breeder Association. Components of (co)variance, direct and maternal heritabilities were estimated for birth weight, WW and AFC using bivariate animal models. Direct and maternal heritabilities were 0.21 and 0.05 for birth weight, 0.40 and 0.05 for WW, whereas direct heritability for AFC was 0.08. The correlations between direct and maternal effects for birth weight and WW were −0.49 and −0.64, respectively. The genetic correlations between birth weight–WW and WW–AFC were 0.36 and −0.02, respectively. Under the conditions of this study, selection for increasing birth weight would increase WW, but increasing WW will not change AFC.
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Segura-Correa, J.C., Chin-Colli, R.C., Magaña-Monforte, J.G. et al. Genetic parameters for birth weight, weaning weight and age at first calving in Brown Swiss cattle in Mexico. Trop Anim Health Prod 44, 337–341 (2012). https://doi.org/10.1007/s11250-011-0026-8
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DOI: https://doi.org/10.1007/s11250-011-0026-8