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Hormones and the Treatment of Sterility in Dairy Cattle: A Review^*

Laboratory of Animal Nutrition, Cornell University, Ithaca, N. Y.

ABSTRACT

During the past few years considerable attention has been paid to the use of hormones as means of correcting infertility in live stock. In many animals in which disease is not very evident, derangements of the normal estrous cycle occur which should be amenable to this type of treatment. These include cases in which the cycle does not occur at all, possibly because the anterior pituitary gland is not functioning correctly or because the corpus luteum persists, preventing the regular cycle of events. Another type of hormonal disorder is found in the nymphomaniac in which the Graafian follicle fails to rupture and becomes cystic, thus causing the cycle to be interrupted. It also has been suggested that many cows with fairly regular cycles fail to conceive or to carry their calves to term because the corpus luteum or the uterus is not performing its function efficiently. Further, it has been suggested that resistance to diseases of the genital tract may be increased in some instances by reinforcing the normal hormonal mechanism.

^* Based upon a paper presented in the symposium on Reproductive Problems of Dairy Cattle at the 43rd Annual Meeting.