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Effect of Light, Temperature, and Hormones on the Reproductive Performance of Ewes^{1, 2,}

South Carolina Agricultural Experiment Station, Clemson

Abstract

Five lots of 20 ewes each were used for a 3-year period to study the effects of light, temperature, light and temperature, and hormones on breeding performance and early lamb production.

All lots receiving treatments had a larger number of ewes exhibiting estrus than did the controls; however, this difference was not significant. In percent ewes lambing, the best results were obtained in 1956 in lot I (light), in 1957 in lot II (temperature), and in 1958 in lot III (light and temperature). For the 3-year period the light, temperature, and light and temperature lots had a significantly higher percent of ewes lambing than the hormone lot; however, only the light and temperature lot was significantly different from the controls. In 1956, using natural service, 72% of the ewes lambed. Artificial insemination was used in 1957 and 1958 and the percent of ewes lambing decreased to 42 and 32%, respectively.

¹ Technical Contribution No. 337, South Carolina Agricultural Experiment Station. Supported in part by funds from the Southern Regional Project, S-29, "Improving the Production of Early Milk Fat Lambs", a cooperative study by agricultural experiment stations in the southern region and the USDA.

² A portion of the dissertation presented by the senior author to the Graduate School of the Clemson Agricultural College, Clemson, S. C. in partial fulfillment of the requirements for the M.S. Degree.

³ Research Assistant in Animal Husbandry, Animal Husbandman, and Dairy Husbandman, respectively.