Survival of equine embryos transferred to normal and subfertile mares

B. A. Ball, R. B. Hillman, G. L. Woods

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


To test the hypothesis that an abnormal uterine environment was a cause of early embryonic loss in subfertile mares, morphologically normal embryos were transferred to normal mares (n = 20) and subfertile mares (n = 20), and embryo survival rates were compared. Embryos were recovered nonsurgically at Days 7 to 8 postovulation and transferred surgically to normal and subfertile mares that had ovulated on the same day or within 2 d after a donor. Survival of transferred embryos was monitored by ultrasonography of the recipient mare's uterus from Day 9 through Day 28 postovulation. There were no significant differences (P > 0.5) in the embryo survival rates at Day 12 ( 11 20 vs 9 20) or Day 28 ( 10 20 vs 8 20) for normal or subfertile mares, respectively. The uterine environment of subfertile mares was apparently adequate to support the development of transferred embryos from Days 7 or 8 through Day 28 postovulation.

Original languageEnglish
Pages (from-to)167-174
Number of pages8
Issue number2
StatePublished - Aug 1987

Bibliographical note

Funding Information:
Acknowledgments: We thank Thornbrook Farms and the Harry M. Zweig Memorial Trust for financial support and the Alumni Association of the New York State College of Veterinary Medicine and Pitman-Moore Inc., Washington Crossing, New Jersey for providing ultrasound machines. We also thank Dr. C. 8. Baker for helpful suggestions. We are grateful to S. Chapman, P. Kelley, J. Lowe, D. Lucas, K. Roneker, and D. Vanderwall for providing technical assistance. Part of these results were presented at the 31st Annual Convention of the American Association of Equine Practitioners (1).


  • embryo transfer
  • embryonic loss
  • infertility
  • mare
  • uterus

ASJC Scopus subject areas

  • Small Animals
  • Food Animals
  • Animal Science and Zoology
  • Equine


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