J. Anim Sci.
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J. Anim Sci. 1985. 60:755-759.
© 1985 American Society of Animal Science
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Reproductive Traits of Sows Penned Individually or in Groups until 35 Days after Breeding1,2,

William E. Schmidt, Jeffrey S. Stevenson and Duane L. Davis3

Kansas State University,4, Manhattan, KS 66506

Abstract

We compared estrous and farrowing traits in 274 Duroc x Yorkshire sows penned either in individual gestation stalls or in groups (four or five sows/group) during the intervals from weaning to breeding and from breeding to 30 to 35 d after breeding. Sows were assigned to treatment by parity (primiparous vs multiparous), checked twice daily for estrus from 3 to 10 d after weaning and artificially inseminated (AI) twice during estrus. Ovaries of anestrous sows were examined at laparotomy. No major treatment effects on estrous response were detected and 88% (45/51) of anestrous sows had only small ovarian follicles. Litter traits were not affected by penning treatments. However, penning sows in groups postbreeding resulted in a 50% reduction (P<.05) in early pregnancy losses as indicated by low serum progesterone 19 to 23 d after AI or return to estrus by 23 d after AI. This resulted in a 12 percentage point higher (P<.05) farrowing rate for group-penned (78%) than for individually penned sows (66%).

Footnotes

1 Contribution No. 84-472-J, Kansas Agr. Exp. Sta., Manhattan, KS 66506.

2 The authors gratefully acknowledge the assistance of S. Christianson and S. Durham in conducting this experiment and T. Paph for typing the manuscript. This research was partially supported by the National Pork Producers Council, Des Moines, IA.

3 To whom reprint requests should be directed.

4 Dept. of Anim. Sci. and Ind.






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