A 3-year-old 817-kg (1,797-lb) Angus bull was evaluated at the J.T. Vaughan Large Animal Teaching Hospital at Auburn University because of an inability to copulate. According to the owners, the bull had successfully sired calves the previous breeding season but had not been observed successfully breeding females during the current season. The owners indicated that the bull displayed acceptable libido and would mount cows normally, but he failed to extend the penis or to achieve intromission. There was no history of previous injury or penile trauma.
The bull had no evidence of muscle atrophy. No genital abnormalities were identified