J. Anim Sci.
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J. Anim Sci. 1965. 24:964-968.
© 1965 American Society of Animal Science
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Oxytocin on Ovarian Function in Cycling and Hysterectomized Heifers1

L. L. Anderson, A. M. Bowerman and R. M. Melampy

Iowa State University, Ames2

Abstract

Interestrous periods of 8 to 9 days were observed in heifers following 7 daily subcutaneous injections of oxytocin beginning at estrus. Oxytocin treatment in partially hysterectomized heifers and in heifers with the uterus opened in situ was equally effective in reducing the interestrous period. The corpus luteum was maintained and no estrus occurred in heifers given oxytocin for 7 days beginning on day 1 and hysterectomized on day 2. Carbon-marked corpora lutea, obtained after hysterectomy and injections of oxytocin, contained progesterone in concentrations equal to that of the mid-luteal phase of the estrous cycle, whereas the concentrations of {Delta}4 pregnen-20 ß-ol-3-one (20 ß-ol) were twice that found during the mid-luteal phase of the estrous cycle. Hysterectomized heifers returned to estruswithin a few days after enucleation of the corpus luteum. The corpus luteum of this estrous period was maintained until slaughter at 60 days. Uterine distention by plastic and metal cylinders in heifers resulted in an inconsistent reduction of the estrous cycle.

Footnotes

1 Journal Paper No. J-4943 of the Iowa Agricultural and Home Economics Experiment Station, Ames, Ia. Project No. 1325. Acknowledgment is made of support by USDHEW, PHS, NIH, A-3730 and American Cyanamid Co., Princeton, N. J. Purified Oxytocic Principle was supplied by M. E. Davenport, Armour Pharmaceutical Co., Kankakee, III. Vitallium cylinders were supplied by Sidney Weisman, Austenal Co., New York, N. Y. Surgery was performed by G. W. Allen and R. F. Bristol, Department of Veterinary Medicine and Surgery.

2 Department of Animal Science.






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Copyright © 1965 by the American Society of Animal Science.