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Effect of Exogenous Progesterone and Unilateral Ovariectomy on Ovarian and Pituitary Gland Activity¹

University of Wisconsin, Madison

Abstract

Seventy-two crossbred gilts were used in a 2³ factorial experiment to study the effects of injecting 150 mg. of progesterone daily from day 2 through 13 and unilateral ovariectomy at day 2 on ovarian and pituitary activity at day 14 and at day 2 following the beginning of the next estrus. At day 14 progesterone injections blocked ovarian compensatory hypertrophy with very little effect on ovarian activity. Progesterone injections also increased residual FSH activity in the pituitary gland. Neither unilateral ovariectomy nor progesterone injections significantly affected average CL weight. By 2 days following the beginning of the next estrus. progesterone injections had resulted in.a lengthening of the estrous cycle, a higher residual LH activity in the pituitary gland and a higher proportion of animals with cystic follicles.

¹ Paper No. 1155 from the Genetics Laboratory and No. 438 from the Department of Meat and Animal Science. Published with the approval of the Director of the Agricultural Experiment Station. This investigation was supported in part by The Ford Foundation, Grant No. 63–505, and by Public Health Service Training Grant No. 5 T01 HD00104-01, from the National Institute of Child Health and Human Development.