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Effects of Prostaglandin F₂ and Pregnant Mares' Serum Gonadotropin (PMSG) on the Reproductive Performance of Fluorogestone Acetate-PMSG-Treated Ewes^1,2,3,

Animal Research Institute, Ottawa, Ontario, Canada K1A 0C6

Abstract

Two experiments were conducted to examine the effect of prostaglandin F₂ (PGF₂) and pregnant mares' serum gonadotropin (PMSG) on the reproductive performance (fertility, prolificacy and fecundity) of ewes previously treated with fluorogestone acetate (FGA) and PMSG. In the first experiment, 29 ewes were synchronized for estrus with FGA and PMSG but not bred at the postsynchronization estrus. On day 10 of the first post-synchronization estrous cycle, they were injected IM with 15 mg PGF2a and 500 IU PMSG and exposed to experienced, fertile, raddled rams. Twenty-four of the 29 ewes (83%) had viable fetuses 9 weeks after the PGF₂-PMSG treatment. In the second experiment, 64 ewes were treated with FGA-PMSG, and 33 were exposed to fertile, raddled rams at the synchronized estrus. A second group of 31 ewes was not bred at the synchronized estrus, but on day 12 of the postsynchronized estrous cycle, they were injected IM with 15 mg PGF₂ and 500 IU PMSG and exposed to fertile, raddled rams. Sixty-six percent of the 3 3 ewes lambed in the FGA-PMSG-treated group and 60% of the 31 ewes lambed in the PGF₂ -PMSG-treated group.

¹ Contribution No. 846 of the Animal Research Institute, Agriculture Canada, Ottawa, Ontario, Canada Kl A 0C6.

² Contribution No. 1-222 of the Engineering and Statistical Research Institute, Agriculture Canada, Ottawa, Ontario, Canada K1A 0C6.

³ Prostaglandin F₂ (Lutalyse) kindly supplied by Dr. L. Rea, Tuco Products, Orangeville, Ontario, Canada.

⁴ Statistical Research Section, Engineering and Statistical Research Institute, Agriculture Canada, Ottawa, Ontario, Canada K1A 0C6.