The competition model was applied to analyze average daily gains of 6,957 Large White gilts. Animals were housed in pens of up to 16 animals with an average 13.7. Included in the model were the direct effect of an animal plus the sum of competitive effects of the remaining animals in the same pen. Different strategies were considered to stabilize the total variance with respect to the number of animals in a pen. The BLUPF90 family of computer programs were used in computations. The heritability of the competitive effect was 3%; however, the likelihood was very flat. This low estimate may be due to the data structure and an unrealistic model. Based on these data and models it is unclear if accounting for competitive effects would impact genetic selection in today's swine breeding populations.

J. Arango, Ignacy Misztal, Shogo Tsuruta, Miranda M Culbertson, W. O Herring, T. Long

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 06.24, 2006
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