Effect of Progesterone Therapy on Embryo Survival in Cows of Lowered Fertility

Abstract

Sixteen repeat breeder cows out of 36 (44.4%) that were injected with 50 mg. of progesterone per day beginning 3 days after heat had normal embryos at 34 days as compared with 12 (33.3%) in an equal number of uninjected control animals. Thirty-one additional animals were injected daily with 200 mg. of progesterone. Twelve of these animals (38.7%) had normal embryos at 34 days as compared with eight (25.8%) in 31 control animals. © 1956, American Dairy Science Association. All rights reserved.