J. Anim Sci.
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J. Anim Sci. 1979. 49:1506-1509.
© 1979 American Society of Animal Science
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Control of Estrus in Gilts with a Progestogen1

D. L. Davis2, J. W. Knight3, D. B. Killian4 and B. N. Day

University of Missouri5, Columbia 65211

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.

Footnotes

1 Contribution from the Missouri Agr. Exp. Sta. Journal Series No. 8271. Approved by the Director.

2 Present address: Dept. of Animal Sciences and Industry, Kansas State Univ., Manhattan 66506.

3 Present address: Dept. of Animal Science, Virginia Polytechnic Institute and State Univ., Blacksburg 24061.

4 Present address: Dept. of Agriculture and Natural Resources, Lincoln Univ., Jefferson City, MO 65101.

5 Dept. of Animal Husbandry.






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Copyright © 1979 by the American Society of Animal Science.