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Enhanced Progesterone and Pregnancy Rate after Gonadotropin Administration in Lactating Ewes¹

University of Nebraska^,2, Lincoln 68583-0908 and and US Department of Agriculture^,3, Dubois, ID 83423

Abstract

Estrus was induced during March and April in 50 lactating ewes that were 20 to 31 d postpartum. Following estrus induction, ewes were treated with either saline or human chorionic gonadotropin (hCG; 100 IU) on d 11, 12 and 13 after mating. Regardless of whether ewes were later diagnosed as pregnant or not, treatment with hCG increased serum progesterone concentrations compared with concentrations observed in saline-treated ewes on d 12, 14 and 16 after mating (P<.01). Pregnancy rate was higher in ewes treated with hCG than that of ewes treated with saline (58 vs 29%; P<.05). Data from the present study indicate that it is possible to increase pregnancy rate in lactating, anestrous ewes after artificially-induced estrus by administering hCG.

¹ Published as Paper No. 6764 Journal Series, Nebraska Agr. Exp. Sta.

² Anim. Sci. Dept.

³ U.S. Sheep Exp. Sta., USDA-ARS.