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Effect of Progesterone Administration on Reproductive Efficiency^{1, 2,}

University of Idaho, Moscow, Idaho

Abstract

The effect of the administration of 500 mg. of progesterone on reproductive efficiency was studied, using 139 apparently normal cows and heifers. The animals in both the treated and control groups were free from detectable infection, disease and other reproductive abnormalities; and all of them had well developed Graafian follicles at the time of breeding. The 70 treated animals had a first service conception of 70.0%, while the 69 controls only had 42.0%. The administration of progesterone to apparently normal cows at first breeding increased the breeding efficiency of the treated group 28.0% over the controls for first service conceptions. The total breeding efficiency for the treated group was 72.2%, 70 conceptions from 97 services compared to 53.9%, 69 conceptions from 128 services for the controls.

¹ Published with the approval of the Director of the Idaho Agricultural Experiment Station as Research Paper No. 437.

² Supported in part by funds provided through the Western Regional Research Project W-49.

³ The authors are indebted to E. R. Squibb and Sons, New York, N. Y., for the Delalutin used in this experiment.

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