Goats do not experience menstruation like humans do. The reproductive cycle of a goat is called the estrous cycle, and consists of four phases. The first phase involves the growth of one or several ovarian follicles and the development of the uterine lining. During this phase, bloody vaginal discharge may occur, which is sometimes mistaken for menstruation. In the second phase, the female begins to exhibit sexually receptive behavior like raising of her hindquarters, and the labia may begin to redden and swell. In the final two stages, the corpus luteum forms and begins to produce progesterone. If pregnancy does not occur, the corpus luteum regresses and the uterine lining is reorganized for the next cycle, instead of being shed through the vaginal opening as it does during menstruation.
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