J. Anim Sci.
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J. Anim Sci. 1969. 28:253-255.
© 1969 American Society of Animal Science
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Effects of Estrogen and Progesterone on Progesterone Levels of Corpora Lutea and on Pregnancy in Heifers1

A. C. Menge2 and R. Verville3

Rutgers Dairy Research Center, Sussex, New Jersey,4

Abstract

A single injection of 20 mg. estradiol valerate was given to eight heifers on day 35 of pregnancy, with half of the group also receiving 100 mg. of progesterone daily. The corpora lutea, removed on day 38, showed significant reduction in the concentration and content of progesterone compared with corpora lutea from four untreated control heifers. Progesterone treatment alone had no effect on progesterone level in the corpus luteum. Estradiol valerate alone caused pregnancy loss and estrus in heifers, whereas in combination with daily injections of progesterone the corpora lutea regressed but pregnancy loss and estrus did not occur. Injection of HCG during the progesterone-treatment period of heifers with the corpus luteum removed induced new corpora lutea that maintained pregnancy in five of nine heifers after progesterone withdrawal.

Footnotes

1 Paper of the Journal Series, Rutgers—The State University, New Jersey Agricultural Experiment Station, New Brunswick.

2 Present address: Center for Research in Reproductive Biology, University of Michigan Medical Center, Ann Arbor.

3 The authors wish to express appreciation to Dr. F. Stormshak and Miss Helen Kelley, Animal Husbandry Research Division, A.R.S., U.S.D.A., Beltsville, Maryland for the progesterone determinations, to E. R. Squibb and Sons for supplying the estradiol valerate and to Schering Corporation for supplying the progesterone.

4 Department of Animal Sciences.






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Copyright © 1969 by the American Society of Animal Science.