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Estimates of Genotype-Environment Interactions in Production and Carcass Traits in Swine¹

University of Wisconsin, Madison 53706

Abstract

Carcass and production traits on 192 pigs were evaluated for genotype x environment interaction, breeding group, feeding regime and year differences. Animals were equally divided among the four breeding groups, Poland China, Yorkshire, Poland China x Yorkshire and Yorkshire x Poland China, the two feeding regimes, high and low nutrient, the four stages of development, 84, 112, 140 days of age and 90 kg, and fed over a 3-year period. Analysis was done within each stage of development.

The number of breeding group x feeding regime interactions detected as "significant" in this study was what would be expected by chance alone if drawn from the same population. Breeding group and feeding regime differences are given and discussed.

¹ This work was done under a cooperative agreement between the Research Division of the College of Agricultural and Life Sciences, University of Wisconsin, and the Animal Science Research Division, A.R.S., U.S.D.A., and supported by Cooperative U.S.D.A.-C.S.R.S. Grants No. 816-15-20 and 916-15-20, and in cooperation with the late Regional Swine Breeding Laboratory, A.S.R.D., A.R.S., U.S.D.A. Published with the approval of the Director of the Research Division of the College, Paper No. 1456 from the Laboratory of Genetics and No. 591 from the Department of Meat and Animal Science.