J. Anim Sci.
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J. Anim Sci. 1982. 55:554-564.
© 1982 American Society of Animal Science
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Carcass and Related Traits in Duroc and Yorkshire Pigs selected for Sow Productivity and Pig Performance1

B. Bereskin2 and L. T. Frobish3

US Department of Agriculture, Beltsville, MD 20705

Abstract

Main and interaction effects of breed, line, sex and season on 15 carcass and two related performance traits were evaluated in 649 Duroc and Yorkshire pigs. Selection of replacement animals in spring litters was based on an index of sow productivity and in fall litters on an index of average daily gain, scan backfat and loin eye area. Control lines were also maintained in each breed in each season. Five generations of selection were represented in spring pigs and three generations in fall pigs. Various statistical models were used to test interaction effects. Breed x fall select vs control lines was the only interaction that was significant for more than one or two traits. A reversal in order of the least-squares means for the select and control lines between the two breeds resulted in the significant interaction effects in eight of nine carcass traits. The Duroc select line was leaner than the Duroc control line but the reverse was generally true for Yorkshires. In main effects, Durocs were generally leaner than Yorkshires and gilts were leaner than barrows. Durocs also exceeded Yorkshires in both gross and lean cuts average daily gain, and barrows were higher than gilts in both traits. Partial regressions of tratis on years suggested possible negative correlated responses to the selection for sow productivity practiced among spring pigs. Residual phenotypic correlations among the traits generally agreed with previous reports. In addition, lean cuts average daily gain was more closely associated with gross average daily gain in slaughtered pigs than with carcass measures of leanness such as loin eye area or percentage lean cuts.

Footnotes

1 The authors acknowledge with appreciation the valuable contributions of James E. Faltynski, Meat Sci. Res. Lab., Animal Science Institute, for supervising the processing of all test animals in a uniform and precise manner, and the technical assistance of Bonnie Morgan, Nonruminant Anim. Nutr. Lab., for determining the percentage of ether extract in loin and ham samples.

2 Nonruminant Anim. Nutr. Lab., Anim. Sci. Institute, NER, ARS, Beltsville, MD.

3 Present address: Head, Dept. of Anim. Sci., Clemson Univ., Clemson, SC 29531.






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Copyright © 1982 by the American Society of Animal Science.