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Recent Advances in Reproductive Efficiency¹

Estrous Cycle and Ovulation Control in Cattle

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

The development of artificial methods for regulating the estrous cycle in various classes of farm animals has long been a goal of animal physiologists. Interest in the subject has been intensified in recent years as a result of the discovery of new information regarding factors affecting ovarian function and the estrous cycle, and because of the development of effective oral steroid hormone preparations.

When a practical method for estrous cycle regulation in cattle is finally developed to the point where large numbers of animals can be successfully bred on a single day, it will probably find its best application in commercial beef cattle operations, where it will make artificial insemination a widespread practice. In the dairy industry the method will probably be used mainly to breed groups of heifers on a single day.

¹ Paper presented at a Joint Production-Extension Symposium at the 56th Annual Meeting of the American Dairy Science Association, University of Wisconsin, Madison, June 14, 1961.