Conception following endoscopic removal of endometrial cysts in a mare

Abstract

A 14-year-old appaloosa mare presented for breeding management. She was in diestrus with a history of failure to conceive that breeding season. In addition to poor vulvar conformation, the mare was determined to have a multi-loculated uterine cyst measuring 27 mm x 70 mm in her right uterine horn. A uterine culture yielded growth of Streptococcus zooepidemicus. Uterine biopsy was graded IIA, with chronic endometritis being the main finding. At hysteroscopy, approximately seven endometrial cysts were seen in the right uterine horn in close approximation to each other and were ruptured using an endoscopic biopsy tool. Endometritis treatment and breeding management were performed during the next estrus. Uterine lavage and infusion of potassium penicillin was performed daily for five days. Ultrasography was performed daily, and the mare was artificially inseminated on day three of treatment. The mare was determined to be pregnant at 60 days and at nine months of gestation.