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

Abstract

Embryonic death is a direct cause of lowered fertility in repeat breeding cows. Tanabe and Casida (10) observed that 66% of the repeat breeding cows with no clinically detectable abnormality had fertilized ova. At 34 days the per cent having normal embryos had decreased to 23. Hawk et al.