J. Anim Sci.
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J. Anim Sci. 1942. 1:309-313.
© 1942 American Society of Animal Science
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A Study of Estrus and Ovulation in the Mare1

John N. Cummings2

Montana Agricultural Experiment Station

Abstract

Conclusions: The length of estrus and diestrus, the time of ovulation, or the type of estrus had little predictive value in the succeeding cycles from the observation of a single cycle due to the variation in the different phases of the estrual cycle studied. In most cases this fact was found true either among the cycles of the same mare or different mares. However, less variation existed in the length of the estrual cycle itself and the time between ovulations.

More variation was shown in all phases of foaling estrus than appeared in subsequent estrual periods.

Footnotes

1 Paper No. 167, Journal Series, Agricultural Experiment Station, Montana State College, Bozeman, Mont.

2 The author is indebted to Dr. F. F. McKensie of the Utah State Agricultural College for his advice and assistance.






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Copyright © 1942 by the American Society of Animal Science.