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Evaluation of possible methods to reduce pain associated with electroejaculation in bulls.

Heart rate changes were recorded in attempt to objectively measure pain associated with 6 methods of semen collection, including transrectal massage, conventional electroejaculation, and electroejaculation after either intrarectal lidocaine, epidural lidocaine, epidural xylazine, or intravenous xylazine. Epidural anesthesia with lidocaine or xylazine tended to result in smaller heart rate changes.