An artificial vagina is a device that imitates the female vagina and provides the appropriate thermal and mechanical stimulation required for ejaculation in horses, sheep, goats, and cattle. Most artificial vaginas have the same basic design, which includes an outer casing, an inner lining, and an insulated pouch that is attached to one end of the outer casing. Water added to the space between the outer casing and inner lining prior to collection is used to regulate the temperature and pressure to which the penis is exposed during collection. During collection from bulls, rams, or bucks, the male is allowed to mount a female or a neutered male. Stallions can be trained to mount a mare or a collection dummy called a phantom. When the male mounts, his sheath is gently deflected to the side and, as he thrusts forward to breed, the artificial vagina is placed over the end of his penis. The male ejaculates into the artificial vagina.
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