J. Anim Sci.
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J. Anim Sci. 1984. 58:275-280.
© 1984 American Society of Animal Science
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Growth and Carcass Traits at 135 Kg for Progeny of Swine Selected for Growth and Backfat1

Daryl L. Kuhlers, Steve B. Jungst, Dale L. Huffman, Joseph C. Cordray and Peter M. Brown

Auburn University2, AL 36849

Abstract

Age and carcass composition recorded for 250 barrows that were the offspring of parents selected one generation for either low or high number of days to reach 105 or 135 kg or for low or high ultrasonically-measured back-fat thickness at 105 or 135 kg, were studied. Selection of the parents had a significant effect on ultrasonically-measured backfat thickness, carcass length, average and l0th-rib backfat thickness, loin eye area, specific gravity, estimated kilograms of muscle and lean tissue growth/day of age of their offspring. The weight at which the parents were selected did not significantly affect growth and carcass composition of the barrows. Progeny of parents selected for low-backfat had longer and leaner carcasses with larger loin eye areas than progeny of parents selected for low days. Pigs that were from parents selected for high-backfat or low days were fatter than pigs from high-days or low-fat selected parents, respectively. Estimated kilograms of muscle at a constant carcass weight was higher in the offspring of parents selected for low-backfat than in the offspring of low-days selected parents, but was less in offspring of high-backfat selected parents than in offspring of high-days selected parents. Lean tissue growth/day of age was approximately equal for the offspring from low-backfat or low-day selected parents and these progeny produced significantly more lean tissue growth/ day than did progeny of high-backfat or high-day selected parents.

Footnotes

1 Contribution from the Alabama Agr. Exp. Sta., Journal Ser. No. 4-82272.

2 Dept. of Anim. and Dairy Science.






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Copyright © 1984 by the American Society of Animal Science.