J. Anim Sci.
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J. Anim Sci. 1984. 58:1144-1150.
© 1984 American Society of Animal Science
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Genetic and Phenotypic Parameters for Sow Productivity1

K. M. Irvin2 and L. A. Swiger3

Ohio Agricultural Research and Development Center, Wooster 44691 and and The Ohio State University, Columbus 43210

Abstract

Data from 609 purebred Yorkshire, Hampshire and Duroc litters were utilized to obtain genetic and environmental parameter estimates for litter number and weight traits at birth, 21 d (first creep) and 42 d (weaning) considered as traits of the sow. Differences among paternal half-sib sets of sows were analyzed. Heritability estimates from this study were .26 ± .12, .28 ± .12 and .30 ± .12 for litter size at birth, 21 and 42 d and .54 ± .13, .17 ± .11 and .15 ± .11 for litter weights at those times, respectively. These estimates indicated that the dam's genetic contribution to litter weight was higher for prenatal growth than during nursing. The heritabilities for litter size were encouraging for within breed selection. Genetic correlations among litter sizes and genetic correlations among litter weights at birth, 21 and 42 d were large and positive. Large, positive genetic correlations also were found between litter size and weight at each of the three times. Negative correlations between litter size and average pig weight at both birth and 21 d and between litter size at birth and average pig weight at 21 d indicated that larger litters were associated genetically with smaller pigs. Phenotypic and environmental correlations generally indicated the same associations.

Footnotes

1 Approved for publication as Journal Article 79-82 of The Ohio Agr. Res. and Dev. Center, Wooster.

2 Dept. of Anim. Sci., The Ohio State Univ., Columbus 43210.

3 Present Address: Dept. of Anim. Sci., Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061.






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Copyright © 1984 by the American Society of Animal Science.