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Effect of Exogenous Progesterone on Corpora Lutea in Unilaterally Hysterectomized Heifers^{1, 3,}

University of Wisconsin, Madison

Abstract

A series of experiments was made to study the effects of exogenous progesterone on CL weight and lifespan in intact and in unilaterally hysterectomized heifers (ipsilateral —ovulating ovary and retained uterine horn on the same side; contralateral—ovulating ovary and retained uterine horn on the opposite side).

Corpus luteum weight at day 15 was not significantly affected by progesterone treatment (100 mg. per day, days 1 through 10), uterine condition (intact, ipsilateral or contralateral ), or the interaction. However, the variance was increased by progesterone treatment in ipsilateral heifers (P<.005) and intact heifers (P<.10).

Progesterone treatment on days 3 through 10 reduced (P<.025) estrous cycle length in intact heifers, but did not reduce cycle length in heifers made either ipsilateral or contra-lateral on day 3 of the treatment cycle.

Progesterone treatment on days 1 through 10 reduced (P<.005) average estrous cycle length in intact heifers. The heifers were unilaterally hysterectomized and given a similar progesterone treatment during a subsequent estrous cycle. Estrous cycle length was reduced (P<.005) by progesterone treatment when the heifers were ipsilateral but it was not reduced by progesterone when the heifers were contralateral.

¹ Published with the approval of the director of the Agricultural Experiment Station, Paper No. 1171 from the Genetics Laboratory. This work was done under a cooperative agreement between the Wisconsin Agricultural Experiment Station and the Dairy Cattle Research Branch, U.S.D.A. It was supported in part by the Branch and also by Public Health Service Training Grant No. 5 T01 HD00104–03, from the National Institute of Child Health and Human Development, and The Ford Foundation, Grant No. 63–505.

³ The advice and support of Dr. L. E. Casida is gratefully acknowledged.

² Supported by Public Health Service postdoctoral fellowship, No. 1 F2 HD–23, 054-01, from the National Institute of Child Health and Human Development. Present address: Department of Veterinary Science, University of Wisconsin, Madison.