J. Anim Sci.
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J. Anim Sci. 1966. 25:212-216.
© 1966 American Society of Animal Science
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Effect of Controlled Environment on the Reproductive Performance of Ewes1

W. C. Godley, R. L. Wilson2 and Victor Hurst3

South Carolina Agricultural Experiment Station, Clemson

Abstract

Four lots of 20 ewes each were used in a 3-year period to study the effects of light, temperature and a combination of light and temperature on reproductive performance. A fifth group of ewes was checked for estrus daily for the 3-year period. Half of the ewes in each of the five lots were produced in South Carolina. They were sired by Polwarth rams and were out of grade Rambouillet ewes. The other half of the ewes were purchased from Montana and were primarily of grade Rambouillet or Columbia x Rambouillet breeding.

The percent of ewes exhibiting estrus in the control lot was significantly lower than in the light, temperature and combination light and temperature lots. Although not significant, the results favored the combination of light and temperature lots. The light, temperature and combination light and temperature lots had a significantly higher percent of ewes lambing than the control lot. Differences between those lots under controlled environmental conditions were not significant.

Footnotes

1 Technical Contribution No. 551, from the Departments of Animal Science and Dairy Science, South Carolina Agriculture Experiment Station. Supported in part by funds from the Southern Regional Project, S-29, Genetic and Physiological Factors Affecting Reproduction of Sheep in the South, a co-operative study by agricultural experiment stations in the southern region and the U.S.D.A.

2 Present address: Animal Science Department, Virginia Polytechnic Institute, Blacksburg, Virginia.

3 The assistance of W. P. Byrd in analyses of these data is acknowledged.






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Copyright © 1966 by the American Society of Animal Science.