Which statement about smegma is correct?

• A. Smegma is a buildup in the sheath that can breed bacteria.
• B. Smegma is a protective waterproof layer.
• C. Smegma is the main component of sweat.
• D. Smegma is the same as sebum.

Answer: (A)

Smegma is the buildup of secretions, shed skin cells, and other debris that collects under the horse’s sheath. It can become thick, crusty, and foul-smelling, and if it’s not cleaned regularly it can harbor bacteria, which may irritate or infect the delicate tissues of the sheath and penis. That’s why describing smegma as a buildup in the sheath that can breed bacteria is the best answer.

It isn’t a protective waterproof layer, so it doesn’t serve a protective skin function in that way. It isn’t the main component of sweat, which is mostly water with electrolytes and some organic compounds. It isn’t the same as sebum, which is the oily secretion produced by sebaceous glands in the skin. In grooming practice, inspect the sheath area, clean it with warm water (and vet-approved products if needed), and monitor for signs of infection such as persistent odor, redness, swelling, or pain.