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Alteration of Ovarian Activity by Hysterectomy¹

University of Wisconsin

Abstract

Complete removal of the uterus in the ewe or cow caused maintenance of the corpus luteum in most animals. The corpora lutea have been maintained for as long as 100 days in the ewe and 154 days in the cow. Longer intervals were not attempted. Removal of approximately half of the uterus in the ewe caused no delay in the return to estrus. Nearly complete removal of the uterus in the cow caused delay in the return to estrus. It was postulated that the corpora lutea, although maintained as anatomical structures, may not function at the same level as corpora lutea in intact animals.

¹ Paper No. 590, Department of Genetics, University of Wisconsin. Published with the approval of the Director of the Agricultural Experiment Station. This work was done under a cooperative agreement between the Wisconsin Agricultural Experiment Station and the Dairy Husbandry Research Branch, U.S.D.A. It has been supported in part by grants from Badger Breeders' Cooperative, Consolidated Breeders' Cooperative, East Central Breeders' Cooperative, Southern Wisconsin Breeders' Cooperative and Tri-State Breeders' Cooperative.

² Agent of the Dairy Husbandry Research Branch, U.S.D.A.

³ The authors wish to acknowledge aid in surgery given by N. C. Buch, A. S. El-Sheikh, H. W. Hawk, C. V. Hulet, H. E. Kidder, C. A. Kiddy and R. V. Short.

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