Abstract:
Restricted maximum likelihood estimates of genetic parameters for weaning weight were obtained fitting a regression on maternal phenotype to account for direct-maternal environmental covariances. For Herefords there was a substantial negative regression on dam's phenotype (up to \Gamma0:2), accompanied by small, negative estimates of the direct-maternal genetic covariance. For Angus and Limousin, the direct-maternal genetic covariance was clearly more important than its environmental counterpart, i.e. an estimate of the direct-maternal genetic correlation of about \Gamma0:5 could not be attributed to a negative environmental relationship not taken into account. Fitting a sire \Theta herd-year interaction as an additional random effect reduced estimates of the direct-maternal genetic covariance for these breeds, resulting in corresponding correlation estimates of \Gamma0:3 to \Gamma0:2.
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