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Effect of Gonadal Hormones on the Gonadotrophic Activity of the Anterior Pituitary Gland of the Spayed Heifer¹

University of Wisconsin, Madison

Abstract

Gonadal hormones were injected into bilaterally ovariectomized heifers to study their effects on pituitary gonadotrophic activity. A single injection of 5 mg. of estradiol-17 β caused a significant decrease in FSH as measured by testes weight of hypophysectomized rats. LH was also found to be significantly lowered in these animals when tested by the method of Parlow, but not when studied by ventral prostate weights of rats although a trend in that direction was present. An injection of 400 mg. of progesterone did not show significant effects on either FSH or LH. A correlation between the two test methods which supposedly measure LH was found to be 0.40.

¹ Paper No. 944 from the Division of Genetics and the Department of Dairy Science, published with the approval of the Director of the Agricultural Experiment Station. This study was supported in part by a grant from the Research Committee of the Graduate School from funds supplied by the Wisconsin Alumni Research Foundation and was done under a cooperative agreement between the Wisconsin Agricultural Experiment Station and the Dairy Cattle Research Branch, U.S.D.A., with partial support from the latter agency.