Variance components for piglet survival in different periods were estimated from individual records from 133,004 Danish Landrace piglets and 89,928 Danish Yorkshire piglets, using a liability-threshold model. The estimates of direct heritability were 0.035, 0.057, 0.027 for liability of survival at farrowing (SVB), from birth to day 5 (SVE) and from day 6 to weaning (SVL) in Landrace, and 0.012, 0.030 and 0.025 in Yorkshire. The estimates of maternal heritability for SVB, SVE and SVL were 0.057, 0.040 and 0.030 in Landrace, and 0.050, 0.038 and 0.019 in Yorkshire. Both direct and maternal genetic correlations between the three survival traits were low or moderate. Direct and maternal genetic correlations between piglet birth weight (BW) and SVE were moderately high, but the correlations between BW and SVB or SVL were low in both populations.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 06.05, 2006
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