The sow’s estrous cycle is 18 to 23 days with an average of 21 days. Each estrus lasts 3 to 5 days and must be completed during this period of time. Otherwise, it will take about 21 days before estrus again.
Symptoms of the estrus in the sow: At the beginning, the genital area begins to enlarge. The mucous membranes in the vulva are pale red and are disturbed. From time to time, they walk and quack and follow the other pigs, but they do not allow the boar to cross the mating for about 1 day. In the middle of estrus, the genital area enlarges in a walnut shape. The mucous membranes in the vulva are flushed. They continue to be restless, but sometimes they are in a daze. Their ears are vibrated and their hands are pressed against their backs. The sows do not stand still and they appear to “stand still†and are willing to accept the public. Pigs cross and mating, this is the best time for breeding, about 1? 2 days. At the end of estrus, they still walked across other pigs, but no longer allowed the boar to cross over and mated. The pudendal area began to contract and the vaginal mucous membrane was lavender, about 1 to 2 days. So when is the maternal estrus mated? Sows ovulate and receive mating in mid-estrus. However, because of the age of the sow, its metabolic levels are different, and the amount of hormone secretion is not the same, the degree of estrus performance is also different. Generally, the old sows have slight performance. It is easy to miss the appropriate breeding period if they do not pay attention; and young sows The performance is fierce and it is easy to identify. In the breeding time, it should be "old with early, small with the evening, not the old with the middle." Generally a estrus mating 2 times.
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