J. Anim Sci.
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J. Anim Sci. 1982. 54:728-738.
© 1982 American Society of Animal Science
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Effects of Season, Parity and Sex on Performance of Purebred and Crossbred Swine1,2,

J. F. Schneider3, L. L. Christian and D. L. Kuhlers4

Lowa State University,5, Ames 50011

Abstract

Data from the Iowa State University crossbreeding study were used to evaluate several nongenetic sources of variation in swine performance. These included year and season of farrow, parity of the dam, sex of the pig, live weight at slaughter and certain two-factor interactions. The following formulas were developed to adjust age at marketing to a standard 100 kg separately for each sex: (1) adjusted days to 100 kg for barrows = 41.4 + 100 (A — 4.14)/W, (2) adjusted days to 100 kg for gilts = 34.6 + 100 (A — 34.6)/W, where A is the actual age and W is the actual weight in kg. Spring-farrowed pigs and litters tended to be superior in weight and survival. The magnitude and direction of the season effects changed across the years resulting in significant year x season interactions. Parity effects were important for early pig weight and all measures of litter performance, with distinct advantages of second-parity dams over first-parity dams. Sex differences were important for individual pig weights and quantitative carcass measurements. Gilts weighed less at all ages but produced superior carcasses. The sex x individual heterosis interaction was significant for days to 100 kg, whereas the sex x maternal heterosis interaction was important for 154-d weight, days to 100 kg, longissimus muscle area and percentage fat-corrected muscle.

Footnotes

1 Journal paper no. J-9727 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project no. 1901.

2 Contributing project to NC-103, Genetic Improvement of Efficiency in the Production of Quality Pork.

3 Present address: Babcock Swine, Inc., Rochester, MN 55901.

4 Present address: Auburn Univ., Dept. of Anim. Sci., Auburn, AL 36830.

5 Dept. of Anim. Sci.






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Copyright © 1982 by the American Society of Animal Science.