J. Anim Sci.
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J. Anim Sci. 1966. 25:381-385.
© 1966 American Society of Animal Science
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Pituitary Potency and Ovarian Activity in Rats on Two Levels of Dietary Energy1

R. A. Bellows2, R. K. Meyer, W. G. Hoekstra and L. E. Casida3

University of Wisconsin,4, Madison

Abstract

A study was conducted with rats fed for 10 days a restricted ration containing 40% less energy than was consumed by rats fed ad libitum, but supplying equal amounts of all other nutrients. The rats were then assigned to a factorially-designed experiment for approximately two estrous cycles with half of the rats receiving ad libitum energy intake and the other half receiving the restricted energy intake. Under these two nutritional levels pituitary potency and ovarian stimulation were studied in rats during proestrus and also after 9 days suppression by exogenous progesterone. Pituitary gonadotropin-producing ability was measured in ovariectomized rats, and the ovarian response to PMS was measured in another group whose pituitary glands were under exogenous progesterone suppression.

Highly significant differences in body weights were produced by differences in energy intake. There was a trend for more vesicular follicles to be found in ovaries of rats on the ad libitum energy intake. No significant nutritional effects on pituitary activity or ovarian response to PMS were found.

Ovariectomy increased pituitary FSH potency, but no nutritional influence on the increase was demonstrated. Progesterone blocked the release of pituitary FSH.

A highly significant negative correlation between pituitary FSH potency and number of vesicular follicles was found.

Footnotes

1 Published with the approval of the Director of the Agricultural Experiment Station, Paper No. 1044 from the Genetics Laboratory.

2 Present address: U. S. Range Livestock Experiment Station, Miles City, Montana.

3 Authors express appreciation to The Upjohn Company, Kalamazoo, Michigan, for supplying the PMS used in this study.

4 Departments of Genetics, Zoology and Biochemistry.






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