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Influence of Estrogen Alone and in Conjunction with Pregnant Mare Serum in Anestrous Ewes^{1, 2,}

New Jersey Agricultural Experiment Station

Abstract

Of 14 ewes injected subcutaneously with 1.4 mg. of estradiol dipropionate, 11 mated within 4 days and one lambed; estradiol was relatively ineffective in inducing estrus. The oral administration of 20 mg. of the dimethyl ether of hexestrol failed to induce estrus. No evidence was obtained that would indicate that estrogen treatment will initiate the estrouscycle in anestrous ewes.

Of 19 ewes receiving estrogen 15 to 17 days prior to a single injection of 250 rat units of PMS, 6 mated and lambed.

¹ Journal Series Paper of the New Jersey Agricultural Experiment Station, The State University of New Jersey, Rutgers University, Departments of Animal and Dairy Husbandry.

² Aided by a grant from Ciba Pharmaceutical Products, Inc., Summit, N. J.