The annual piglet production of sows is generally only 1.8 litters. In production in recent years, a new method of producing 2—2.5 litters per year has been successfully tested. First, select gilts. Good sows are an important guarantee for prolificacy. Healthy individuals, non-genetic diseases, normal growth and development, and individuals who are mentally active and disease-free should be selected as gilts. Second, early weaning piglets weaning age. The piglets begin to adjust and induce food 7-10 days of age, and begin to feed some good palatability feed to stimulate the digestive tract and promote the development of digestive tract of piglets. By the age of 20 days, they have officially eaten, and they mainly feed the full-price or dry-powdered material of the piglets to compensate for the lack of milk in the sows. This can be weaned 35-40 days of age. Third, a reasonable arrangement of sow breeding season. Practical experience shows that it is best to arrange breeding in the spring from April to May, and calving from August to September. September-October breeding again, 1st-February of the following year, litter, 2-3 months breeding. Repeatedly cycling allows sows to breed more in the spring and fall seasons, avoid cold winters and hot summers, and increase sow reproduction rates and piglet survival rates. Fourth, the drug aphrodisiac. After 3 to 5 days after weaning, the piglets used the following medicines (agents) to aphrodisiac: Chinese herbal medicine, such as 50 grams of Vaccaria, 30 grams of motherwort, 20 grams of heather leaves, and water for frying, once a day, and even served 5-7 times. day. Motherwort, Chinese angelica root, old paper and Epimedium each have 25 grams, 50 grams of red cilantro, Cistanche, and yangqi. Decoction add 5 grams of brown sugar, feed once a day for seven days. Winter can be added Shichangpu, Chen Ai Jian Jianfu service, the sow aphrodisiac drug after a week can be estrus. Fifth, timely breeding. In terms of species, local sows should be bred within 2-3 days after estrus (preferably best in the morning or in the morning), and hybrid sows should be bred on the afternoon of the second day after estrus. As far as age is concerned, breeding is based on the principle of "early match with early, small match with late, not ageing with middle". The method of controlling the timing of sow mating is to press the sow's buttocks by hand. If the sow shows peace and posture for urination, it can be used for breeding.
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