Surgical results and fertility following correction of vesicovaginal reflux in mares.
Abstract: To evaluate the surgical results and fertility of mares bred at various intervals relative to surgical management of urovagina. Methods: Sixty-one mares underwent surgery to correct vesicovaginal reflux. Surgery was performed at varying times relative to breeding and postoperative fertility was evaluated. Results: Five mares were lost to follow-up and a further four were electively not bred. Of the remaining 52 mares, seasonal pregnancy and live foaling rates were 67% (35/52) and 54% (26/48), respectively. When mares were bred in the same cycle as the surgery, the first cycle following surgery, the second cycle following surgery or the following breeding season after surgery the seasonal pregnancy rates were 89% (8/9), 63% (10/16), 67% (2/3) and 63% (15/24), respectively. After censoring four mares that died of natural causes pre-foaling, the foaling rates were 88% (7/8), 50% (7/14), 0% (0/3), 52% (12/23), respectively. All mares bred in the same cycle as surgery or in the next cycle were bred once only that season, so the pregnancy rate per cycle of 72% (18/25) was identical to the seasonal pregnancy rate. Conclusions: Good fertility (comparable to a normal population of mares) was achieved following surgery and the results suggest that delaying breeding until the following breeding season is not necessary. In addition, breeding in the same cycle as surgical repair is a previously unreported technique that should be considered to maintain a yearly foaling interval.
Publication Date: 2010-06-10 PubMed ID: 20529026DOI: 10.1111/j.1751-0813.2010.00556.xGoogle Scholar: Lookup
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- Journal Article
Summary
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The research investigates the efficiency of surgical interventions and subsequent fertility rates in mares diagnosed with vesicovaginal reflux and suggests that delaying breeding until the following breeding season after the surgery is not necessary.
Surgical Procedure and Schedule
- Sixty-one mares diagnosed with vesicovaginal reflux, a condition wherein urine enters the vagina, were selected to undergo surgery.
- The timing of the surgical procedures varied based on various breeding times of the mares. This was carried out in an effort to determine the most effective timing between the surgical procedure and breeding for optimum fertility results.
Research Findings
- Out of sixty-one, five mares were lost to follow-up and four were not bred by choice. The fertility of the remaining 52 mares was studied postoperatively.
- The seasonal pregnancy and live foaling rates were established at 67% and 54% respectively. This means that out of every 100 mares that underwent the procedure, 67 became pregnant and 54 were able to deliver a live foal.
Breeding Schedules and Fertility Rates
- The research studied mares bred at different intervals post-surgery including the same cycle as surgery, the first cycle following surgery, the second cycle following surgery, and the following breeding season after surgery.
- The highest seasonal pregnancy rate was observed in mares bred in the same cycle as surgery (89%), followed by the second cycle following surgery (67%), and the following breeding season after surgery (63%).
- All mares that were bred in the same cycle as the surgery, or in the next cycle, were bred only once that season. Their pregnancy rate per cycle was 72%, which corresponded to their seasonal pregnancy rate.
Research Conclusion
- The study concludes that the surgical procedure yielded good fertility rates that were comparable to a normal population of mares, which did not undergo any surgical procedure.
- The results suggest that delaying breeding until the following breeding season is not necessary, challenging the traditional wisdom and offering a newer perspective.
- The unique technique of breeding in the same cycle as surgery offers promising results, providing a fresh direction for maintaining the annual foaling interval in mares.
Cite This Article
APA
Jalim SL, McKinnon AO.
(2010).
Surgical results and fertility following correction of vesicovaginal reflux in mares.
Aust Vet J, 88(5), 182-185.
https://doi.org/10.1111/j.1751-0813.2010.00556.x Publication
Researcher Affiliations
- Goulburn Valley Equine Hospital, Goulburn Valley Highway, Congupna, Victoria 3633, Australia. sarahjalim@hotmail.com
MeSH Terms
- Animals
- Animals, Newborn
- Breeding / methods
- Female
- Fertility / physiology
- Horse Diseases / pathology
- Horse Diseases / surgery
- Horses
- Male
- Pregnancy
- Vaginal Diseases / pathology
- Vaginal Diseases / surgery
- Vaginal Diseases / veterinary
Citations
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