J. Anim Sci.
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J. Anim Sci. 1977. 44:549-556.
© 1977 American Society of Animal Science
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Estimates of Genotype x Environment Interactions within and between Two Breeds of Swine for Production and Carcass Traits1

Daryl L. Kuhlers2, A. B. Chapman and N. L. First

University of Wisconsin, Madison 53706

Abstract

Ninety-five animals representing straightbred Poland Chinas and Yorkshires and their reciprocal crosses were fed individually from 56 days of age to 90 kg on two feeding regimes, low and high nutrient, over a 2-year period. These pigs were by eight sires, two from each breed each year. Production traits studied were average daily gain, average daily feed consumption, feed efficiency (gain/feed), average daily total digestible nutrients consumption (TDN), TDN efficiency (gain/TDN), average daily digestible protein consumption, digestible protein efficiency (gain/protein) and average live animal backfat probe. Carcass traits studied were carcass weight, carcass length, average backfat, loin eye area, lean cuts weight, belly weight and lean cuts efficiency (ratio of lean cuts weight to total feed consumed). The breed of sire x breed of dam interaction, an estimate of heterosis, was significant for loin eye area, lean cuts efficiency and all the production traits except average live animal backfat probe. No sire breed x feeding regime or dam breed x feeding regime interactions were found. The sire breed x dam breed x feeding regime interactions for average daily TDN consumption, average daily digestible protein consumption, digestible protein efficiency and average carcass backfat were detected as significant. Significant within breed interactions (interactions of sires within sire breed) were detected only for carcass weight and belly weight. With the feeding regimes imposed in this study, the between breed interactions with feed were not a significant source of variation for the traits studied. Nor were the interactions of sire within sire breed with dam breed and feeding regime significant sources of variation. Thus the ranking of sires based on crossbred or straightbred progeny was similar regardless of which of the two regimes was used.

Footnotes

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 Sciences 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. Paper No. 1873 from the Laboratory of Genetics and No. 667 from the Department of Meat and Animal Science.

2 Present address: Department of Animal Science, 239 Kildee Hall, Iowa State University, Ames 50011.






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Copyright © 1977 by the American Society of Animal Science.