Control of Estrus in Gilts with a Progestogen

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Abstract
Two trials were conducted to evaluate the effectiveness of a synthetic progestogen, allyl trenbolone6, for control of estrus and ovulation in gilts. Estrus was effectively synchronized with 33 of 38 gilts exhibiting estrus 2 to 7 days after last progestogen feeding. There was no effect on fertilization rate in gilts free of ovarian abnormalities. Ovulation rate was higher in gilts fed the progestogen in both Trial 1 (P<.01) and Trial 2 (P<.10). Progestogen treatment caused an increase (P<.01) in the incidence of cystic follicles which resulted in a decrease (P<.01) in conception rate in Trial 1. Copyright © 1979. American Society of Animal Science . Copyright 1979 by American Society of Animal Science