Superovulatory and endocrine responses in holstein heifers treated with either prostaglandin F(2alpha), cloprostenol or fenprostalene.

Fifty Holstein heifers were each superovulated three times with FSH-P. At 60 h after the first injection of FSH-P, the animals received either prostaglandin F(2alpha), cloprostenol or fenprostalene in random order. A significant decrease in serum progesterone and a significant increase in serum estradiol-17beta were observed within 24 h of prostaglandin injection, but there were no significant differences among the three treatments. Neither were there any significant differences among the treatments with respect to the frequency of nonresponse to FSH-P treatment, nor the total number of ova/embryos collected between Days 6 and 8 of gestation.