J. Anim Sci.
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J. Anim Sci. 1974. 38:1218-1223.
© 1974 American Society of Animal Science
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Effects of Origin and Environment on Reproductive Phenomena in Rambouillet Ewes. II. Lamb Production

C. V. Hulet1, M. Shelton2, J. R. Gallagher3 and D. A. Price1

U. S. Department of Agriculture, Dubois, Idaho 83423 and Texas A & M Experiment Station, San Angela, Texas 76901,4

Abstract

A 2-year experiment was conducted to study the effects of location (Dubois, Idaho and McGregor, Texas) and origin of ewe (Texas or Northwest) on lamb production of Rambouillet ewes. A seasonal estrual pattern was observed which markedly affected lamb production. Percentage of ewes lambing and lambing rate were lowest in October, highest in April and July, and intermediate in January. Percentage of ewes lambing, lambs born per ewe, lambs weaned per ewe and lambs marketed per ewe were generally higher for October and January lambing at the Texas location than at the Idaho location and higher in April and July at the Idaho location than at the Texas location. However, no Northwest ewes lambed in Texas or Idaho during October the first year and only 6% at either location during October the second year. It is also significant that only 6% of the Texas-origin ewes lambed during October in Idaho the second year.

Footnotes

1 Agricultural Research Service, Western Region, U.S. Sheep Experiment Station, Dubois, Idaho in cooperation with the Idaho Agricultural Experiment Station.

2 Texas A & M University, San Angelo, Texas.

3 Current address, Roseworthy Agricultural College. Roseworthy S. A., Australia.

4 The authors gratefully acknowledge the technical assistance of H. D. Willes, H. D. Frederiksen and C. Evans.






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