J. Anim Sci.
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J. Anim Sci. 1974. 39:1129-1135.
© 1974 American Society of Animal Science
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Influence of Breed on Response to Exogenous Hormones in Estrous and Anestrous Ewes1

Danny B. Laster2 and Hudson A. Glimp3

U. S. Department of Agriculture Clay Center, Nebraska 68933

Abstract

Three experiments were conducted, using 1,488 ewes during seasonal anestrous and during the normal estrous period, to evaluate the influence of breed on response to exogenous hormones. Treatment was intravaginal, progestogen pessaries Days 1 to 16, 10 mg crystalline progesterone on Day 16, followed by 750 IU PMS on Day 17. In the anestrous ewes a second PMS injection was given on Day 32 in one experiment and in one experiment the progestogen followed by a single injection of PMS was repeated 10 days after the first PMS injection. Breeds included were Rambouillet, Targhee, Hampshire, Dorset, Suffolk, Corriedale, Coarse Wool and Finnsheep-cross (1/2). Parameters studied were ovulation rate, mating data and lambing performance.

Breed influenced (P< .05) response to exogenous hormones during the normal breeding season and during seasonal anestrous. There was also a significant breed by level of PMS interaction on ovulation rate and there was a good indication that a breed by treatment interaction exists for percentage ewes lambing and percentage lambs born per ewe lambing.

Footnotes

1 Cooperation of the Nebraska Agricultural Experiment Station, University of Nebraska, Lincoln, is acknowledged.

2 U.S. Meat Animal Research Center, A.R.S.

3 Present address: 57 14th Street, Wheatland, Wyoming 82201.






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Copyright © 1974 by the American Society of Animal Science.