Merck Manual

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Excretory ducts, dairy bull
Excretory ducts, dairy bull

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.

Courtesy of Dr. Donald R. Monke.