Pizzle rot is an infection in the sheath area of the ram. It is caused by the bacteria, Corynebacterium renale or one from that group. The other factor is high protein diets (>16 percent). Ammonia, produced by the excess urea in the ram’s urine can cause severe irritation and ulceration of the skin around the preputial opening. The debris from the ulcer form a crust which may block the opening to the prepuce. Pizzle rot can affect a ram’s desire and ability to mate.