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Breed Differences in Return to Estrus after PGF₂ -Induced Abortions in Swine^1,2,

Iowa State University, Ames 50011

Abstract

Fifty-seven Duroc, 41 Landrace and 38 Yorkshire purebred sows in d 10 to 53 of pregnancy were aborted to synchronize estrus by using prostaglandin F₂ (PGF₂). Breed differences in time between injection of two 10-mg doses of PGF₂ and return to estrus were observed in these three breeds of pregnant sows during two breeding seasons. Duroc sows returned to estrus .9 d faster (P<.01) than Yorkshire and 1.3 d faster (P<.01) than Landrace sows. Seasonal differences were also observed. The mean days from injection to estrus were 1.8 d fewer (P<.01) for the spring season than in the fall season. All sows expressed estrus 5 to 11 d after injection. Normal gestation, parturition and piglet survival were observed in the sows after the treatment. Genetic differences in response to induced abortion and return to estrus could have implications in planned breeding and farrowing systems.

¹ Journal Paper No. J-11576 of the Iowa Agr. and Home Econ, Exp. Sta., Ames. Project No. 2594.

² The authors gratefully acknowledge the Upjohn Co., Kalamazoo, MI, for supplying part of the Lutalyse® used for this research.