Epithelial Crypts in the Preputial Lining of the Bull.

Epithelial Crypts in the Preputial Lining of the Bull.
Protozoa like Tritrichomonas foetus are protected by, and proliferate in the epithelial crypts of the preputial lining of the bull. These crypts are deeper and more extensive in older (>4 years) bulls.

McEntee K (1973)