Normal male horses produce a fatty secretion from the sheath surface known as smegma. Each horse is an individual and produces different amounts, types and odors. Management, stabling, exercise and a variety of factors also contribute to how “dirty” a horse’s sheath becomes.
The development of large masses of smegma (beans) in the urethral fossa at the tip of the penis is common in geldings, especially those that are kept in stalls. In most cases, beans do not cause any obvious problems and are noticed when someone palpates the area or cleans the sheath.
However, beans may cause urine spattering and sheath swelling as they get larger. In rare cases, they cause painful or difficult urination. An extremely large bean can actually cause signs of colic.
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