Objective: To evaluate the fertility of mares bred at various intervals relative to surgical management of rectovaginal fistula (RVF).
Materials And Methods: Surgical repair of RVF was performed in 28 mares at variable times relative to foaling (30 days to 24 months) and also relative to rebreeding (same cycle or delayed). Postoperative fertility was then evaluated.
Results: Two mares were already pregnant at the time of surgery and 20 of 23 mares (87%) that were bred immediately prior to or following surgery conceived from their first service. When mares were bred in the same cycle as surgery, the next cycle following surgery or in the following breeding season after surgery the pregnancy rate was 5/5, 5/6 and 10/12, respectively, and the foaling rates were 4/5, 4/6 and 7/12. The two mares already pregnant at the time of surgery foaled successfully.
Conclusions: Excellent fertility can be achieved following surgical repair of RVF and our results suggest that delaying breeding until the following breeding season is not necessary. In addition, breeding in the same cycle as the surgical repair is a previously unreported technique that should be considered to maintain normal fertility and a yearly foaling interval.
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