Performance of 2624 boars from 92 sires was recorded in a commercial group-housed environment using electronic feeders that allowed restriction of feed intake. Litter mates were randomly allocated to one of three feeding levels. Variances of sire intercept and slope were derived from reaction norm models by regressing performance of progeny on mean daily feed intake of each feeding level deviated from the overall mean feed intake. Genetic parameters were then estimated as a function of feeding level. The genetic variance of sire slope explained 3.6, 2.5 and 2.7 percent of the phenotypic variance of daily feed intake (P<0.05), growth rate (P:0.11) and feed conversion ratio (P:0.10), respectively. No genotype by feeding level interaction was found for backfat. Variance components were also obtained from a sire model and a model fitting sire and the interaction of sire by feeding level as random effects.

S. Hermesch, A. E Huisman, B. G Luxford, H. U Graser

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 06.03, 2006
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