J. Anim Sci.
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J. Anim Sci. 1971. 33:1048-1052.
© 1971 American Society of Animal Science
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Oxytocin and the Secretion of Luteinizing Hormone in Cattle1

John W. Wilks2 and William Hansel

Cornell University, Ithaca, New York3 14850

Abstract

Frequent collection of jugular blood samples on days 2 through 6 of the estrous cycle from three control and three treated heifers showed that plasma concentrations of LH were not affected by exogenous oxytocin for a period up to 8 hr. postinjection. A similar experiment employing blood samples collected 10 to 21 hr. after injection, from three control and three treated heifers, again showed that plasma LH levels were not lowered or elevated by oxytocin. Pituitary content and concentrations of LH and FSH in these animals, sacrificed at day 7 of the estrous cycle, had not been altered by oxytocin treatment. Corpus luteum progesterone concentration and total progesterone content were not significantly reduced by oxytocin treatment. Peripheral blood concentrations of LH were higher on Days 3 and 4 than on days 2, 5 and 6 of the bovine estrous cycle. These elevated LH values represent a normal, physiologic stimulus for maximal luteal development and increased corpus luteum function which occurs after day 4 of the cycle.

Footnotes

1 This research was supported in part by the cooperative regional research project NE-41 entitled "Endocrine Factors Affecting Reproduction in the Bovine Female" and by NIH Training Grant in Reproductive Physiology HD-00171.

2 Present address: Fertility Research, The Upjohn Company, Kalamazoo, Michigan 49001.

3 Department of Animal Science and Division of Biological Sciences.






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Copyright © 1971 by the American Society of Animal Science.