Symposium on Reproduction, September 6-7, 1973, School of Veterinary Medicine, University of California, Davis : sponsored by American Veterinary Society for the Study of Breeding Soundness, American College of Theriogenologists, School of Veterinary Medicine, University of California, Davis.

  • Symposium on Reproduction (1973 : Davis, Calif.)
Date:
[1973?]
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Licence: Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

Credit: Symposium on Reproduction, September 6-7, 1973, School of Veterinary Medicine, University of California, Davis : sponsored by American Veterinary Society for the Study of Breeding Soundness, American College of Theriogenologists, School of Veterinary Medicine, University of California, Davis. Source: Wellcome Collection.

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    3 peripheral blood of mares, as indicated in the next slide [Slide #5]. The next slide [Slide #6] errphasizes that there is no difference as to cycle length, length of estrus, length of diestras, or corpus luteum lifespan in mares that ormiate one or more follicles. The mare is cilso sonev^iat unusual cotpared to other large domestic species, [Slide #7] in that she is receptive for a number of days prior to ovulation, vÄiereas the sow and ewe ovulate shoirtly before they go out of heat, on about the 2nd day of heat, and the cow ovulates on the 2nd day folloving the onset of heat, often after she is out. The average ovula¬ tion time in our studies has been sonev^iere between the 4th and 5th day of estrus. [Slide #8]. The sequence of follicle developnnent preceding ovu¬ lation during estrus can be seen as being linear in fashion with an ovu¬ latory size of 45 ram reached slightly prior to ovulation. The next slide [Slide #9] errphasizes the relationship of ovulation to the end of estrus. Our data confirms the data of many others in the literature, in that most ovulations in the mare oooir one or two days prior to the end of estrus. The fact that a mare goes out of heat is strong retrospective evidence that she has ovulated. The next point of interest in the mare is the fact that follicular developnent often continues to occur following ovulation. [Slide # 10] This follicular developnent at times resiiLts in ovulation during the luteal phase of the cycle anyvÄiere from 2-12 days following the first ovulation. The veterinary practitioner vího is only able to occasionally exainine mares at weekly intervals, or greater, could be confused by the occurrence of ovulation during the luteal phase of the cycle. These luteal phase ovulations apparently result in the formation of normal corpora