Signs of Estrus in Goats and Sheep The ability to identify estrus in goats and sheep is a key component of professional reproductive management in small ruminant herds. Accurate detection of estrus allows for proper timing of natural mating or artificial insemination, thereby increasing conception rates and maximizing the genetic progress of the flock. Estrous Cycle Duration Goats: The estrous cycle lasts on average 21 days, within a range of 18–24 days. Sheep: The cycle is shorter, averaging 16