Excretory ducts, dairy bull
Courtesy of Dr. Donald R. Monke.
A yearling dairy bull with a congenital malformation of the orifices of the excretory ducts as they open onto the colliculus seminalis. The left orifice is a circular opening that cannot close. The right orifice is directed caudally. Neither is a normal longitudinal slit. This bull had bilateral vesiculitis. The vesicles were palpably fibrotic at their base adjacent to the prostate.