Objective: To develop a novel technique for left paralumbar laparoscopic bilateral ovariectomy in standing, sedated mares.Study design: Prospective descriptive clinical study.Animals: Twelve client-owned mares.Methods: Healthy mares with normal ovarian palpation and ultrasonographic appearance were enrolled. Horses were restrained in standing stocks and administered a variable rate infusion of sedation. A left paralumbar bilateral ovariectomy was performed with 1 laparoscopic and 3 instrument portals. Access to the right ovary was facilitated by retracting the descending colon and associated mesentery with a fan retractor. Ovaries were removed with traumatic forceps, and a blunt tip vessel sealing device. A laparoscopic portal within the 17th intercostal space provided good visualization of the right ovary and reduced interference between instrumentation. Complications were recorded during hospitalization. In addition, an owner follow-up questionnaire was used to determine complications after discharge from the hospital.Results: Left paralumbar bilateral ovariectomy was successful in all 12 mares, with a mean surgical time of 76 6 8 minutes. Postoperative complications occurred in 4/12 (33%) mares and included fever, mild colic, incisional swelling, and azotemia. Complications resolved and mares returned to full activity, with complete owner satisfaction.Conclusions: Bilateral ovariectomy can be successfully achieved with minimal morbidity in standing mares with normal ovarian ultrasonographic appearance via left paralumbar laparoscopy.

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