Survival of equine embryos transferred to normal and subfertile mares.
Abstract: 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.
Publication Date: 1987-08-01 PubMed ID: 16726302DOI: 10.1016/0093-691x(87)90264-0Google Scholar: Lookup
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- Journal Article
Summary
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This research study explores whether the survival rate of horse embryos transplanted into subfertile mares is different than those transplanted into normal mares. The results indicated no significant differences in survival rates, suggesting that an abnormal uterine environment might not be the main cause of early embryonic loss in subfertile mares.
Research Aim
- The aim of this research was to test the hypothesis that an abnormal uterine environment contributes to early embryonic loss in subfertile mares. This was done by transplanting morphologically normal embryos into both normal and subfertile mares and comparing the embryo survival rates.
Methodology
- The embryos were nonsurgically recovered at days 7 to 8 post-ovulation and transferred surgically to mares that had ovulated on the same day or within 2 days after a donor.
- The researchers monitored the survival of the transferred embryos by performing an ultrasonography on the recipient mare’s uterus from Day 9 through Day 28 postovulation.
Findings
- The results showed no significant differences in the embryo survival rates at day 12 or day 28 postovulation between normal and subfertile mares.
- These findings imply that the uterine environment in subfertile mares is adequate to support the development of transferred embryos from day 7 or 8 through day 28 postovulation.
Conclusion
- In conclusion, the research findings challenge the hypothesis that an abnormal uterine environment is the cause of early embryonic loss in subfertile mares.
- These results suggest that other factors beyond the state of the uterine environment may contribute to early embryonic loss in subfertile mares.
Cite This Article
APA
Ball BA, Hillman RB, Woods GL.
(1987).
Survival of equine embryos transferred to normal and subfertile mares.
Theriogenology, 28(2), 167-174.
https://doi.org/10.1016/0093-691x(87)90264-0 Publication
Researcher Affiliations
- Department of Clinical Sciences New York State College of Veterinary Medicine Cornell University Ithaca, NY 14853 USA.
Citations
This article has been cited 2 times.- Shilton CA, Kahler A, Davis BW, Crabtree JR, Crowhurst J, McGladdery AJ, Wathes DC, Raudsepp T, de Mestre AM. Whole genome analysis reveals aneuploidies in early pregnancy loss in the horse. Sci Rep 2020 Aug 7;10(1):13314.
- Meyers PJ, Bonnett BN, McKee SL. Quantifying the occurrence of early embryonic mortality on three equine breeding farms. Can Vet J 1991 Nov;32(11):665-72.
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