Litter weight characteristics are essential components for piglet survival in a context of animal welfare. This study explores consequences of a selection for prolificacy and production traits on litter weight characteristics in the Tai Zumu population from 2008 to 2013. Breeding values were estimated with the best linear unbiased predictor. A high selection pressure performed on litter size slowed down the genetic gain on piglets mean weight within litter (MW, -1g at birth from 2012 to 2013) that was previously sustain by selection against the age at 100kg (rg=-0.53 at birth and -0.56 at 3 weeks). Genetic trends for standard deviation of weight within the litter (SDW) slow down but are still increasing (+1.4g at birth from 2012 to 2013). A selection against SDW may be performed to improved homogeneity but must take into account MW due to unfavorable correlation.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Genetic Improvement Programs: Breeding objectives, economics of selection schemes, and advances in selection theory (Posters), , 401, 2014
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