Alpacas are reproductively very different than cows, sheep, goats or horses. Unlike all those other species, female alpacas do not have a regular estrous cycle where they come into heat at regular intervals. Camelids are induced ovulators. This means that the female does not ovulate any eggs (oocytes) until she has been bred by the male. The act of breeding stimulates hormonal events inside the female which result in ovulation and hopefully conception.