Am. Soc. Anim. Prod.
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Am. Soc. Anim. Prod. 1938:228-232
© 1938 American Society of Animal Science
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Variations in estrus and ovulation in the mare and breeding results*

Frederick N. Andrews and Fred F. McKenzie**

Missouri Agricultural Experiment Station, Montana State College, and U. S. Department of Agriculture, cooperating

Abstract

  1. Seven of 9 mares became pregnant during "split" estrus following natural or artificial insemination.
  2. Ovulation was found to occur in some mares after they had passed out of estrus. Insemination resulted in pregnancy in 3 of 4 cases.
  3. Pregnancy followed insemination in 6 of 7 cases of physiological estrus.
  4. The artificial rupture of follicles did not, in itself, prevent subsequent ovulation and conception following insemination.

Footnotes

* Contribution from the Department of Animal Husbandry, Missouri Agricultural Experiment Station Journal Series No. 587.

** The authors wish to express their appreciation to Mr. J. R. Quesenberry, Dr. E. B. Osborn, Mr. Frank King, and other members of the staff at the U. S. Range Livestock Experiment Station for the cooperation which they have given in making this study possible.






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Copyright © 1938 by the American Society of Animal Science.