Live weight (LW) and hot carcass weight (CW) of slaughter pigs were first corrected for fixed and random effects with a sire-dam model. Residuals from this model were then transformed to all-or-none traits with a threshold at +1.0 or -1.0 residual standard deviation, or to absolute residuals, and analysed for within-family variation with a sire-dam model and an animal model. Despite the delivery strategy aimed at carcasses in a weight range of 82-98 kg, LW and CW as measured were clearly heritable (h2=0.53 and 0.36). Heritabilities of transformed residuals were about zero for both transformations, suggesting that genetic selection within sire and dam lines for less within-family variation in LW and CW is not efficient. However, a significant sire-line effect was found on absolute residuals of LW and CW, indicating differences between sire lines in uniformity of their progeny.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 06.23, 2006
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