J. Anim Sci.
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J. Anim Sci. 1957. 16:151-157.
© 1957 American Society of Animal Science
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The Influence of Exogenous Progesterone on Follicular Development and Pituitary Hormonal Content of Beef Heifers1

John E. Nellor and Harold H. Cole

University of California2

Abstract

The pituitary hormonal content in seven heifers treated with 1120 mg. of progesterone 6 days before slaughter was compared to that of seven control heifers. Exogenous progesterone in amounts capable of inhibiting estrus and ovulation had no detectable effect on the hormonal content of the anterior pituitary of beef heifers regarding FSH, ICSH, TSH and GH stimulating activity.

The ratio of ICSH:FSH activity of beef heifer anterior pituitary is 6:1.

Footnotes

1 This paper is part of a thesis submitted by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy in comparative physiology. Present address: Dept. of Physiology and Pharmacology, Michigan State University. Acknowledgement is made to Dr. Miriam Simpson, Dept. of Anatomy, School of Medicine, University of California, for assistance in acquiring histological assay techniques.

2 Department of Animal Husbandry, Davis, Calif.






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Copyright © 1957 by the American Society of Animal Science.