How can pigs have more piglets?

1. Choose a good reserve sow. Backup sows should be selected from the offspring of high-yielding boars and sows, and pay attention to those sows with many nipples. two。 Initial adaptation is very important. In general, under normal feeding and management conditions, it is appropriate for local breeds to start breeding when they are 6 ~ 7 months old and weigh more than 50 kg, and for foreign breeds when they are 9 ~ 10 months old and weigh more than 75 kg. Generally speaking, sows have the strongest reproductive ability from the third to the seventh birth, with the largest number of litters, and the piglets are of great birth weight, strong physique and strong vitality. After the seventh birth, the reproductive ability gradually decreased. After 6-7 years of utilization, the reproductive ability of sows decreased significantly, which should be renewed in time. Carefully observe the sow estrus to achieve timely breeding. When the redness and swelling of the vulva of the oestrus sow has just begun to subside, and the hand pressure on the waist of the sow is motionless, mating is the most appropriate. In terms of time, the suitable time for mating is 1930 hours after the beginning of estrus in sows. Because this period of time is close to the ovulation time of sows. 3. Skillfully nurture the tube before match. Sows should keep 70% to 80% fat before mating, and feed more green succulent feed, which can promote normal estrus, improve the quantity and quality of ovulation, facilitate mating conception and increase litter size. In general, the protein content should not be less than 10% of the total feed; and calcium should be supplemented appropriately. Sows should be released for exercise and basked in the sun every day to strengthen their physique and promote ovulation. 4. Mating technology is also critical. In order to increase the litter size of sows, repeated matching and double matching should be adopted. Repeated mating means that during a period of estrus in a sow, a boar is used to mate twice, and the interval between the two mating generally varies from 12 to 20 hours, which can make the sow litter give birth to an extra 0.5 litter. Double mating is to mate with two boars of the same breed or two different breeds of boars during a period of estrus in sows. The method is that after the first boar and sow mate, the interval is 15 to 20 minutes, and then another boar is used to mate, which can increase the litter size of sows by more than 15% to 20%. 5. Intensive breeding of pregnant pigs ensures prolificacy. In order to make the fertilized eggs fully develop in the sows, the early stage of pregnancy should be fed with more protein and vitamin-rich feed, properly matched with green feed, 1.5 kg daily feed. When pregnant for 20 days or so, sows should prevent falls, fights, squeezes and sudden changes in feed and environment and disease; raise them in circles after two months of pregnancy, exercise properly and bask in the sun to prevent miscarriage; enter the heavy pregnancy period for more than three months of pregnancy, feed should be increased compared with the previous period, with a daily feed amount of 2.5 kg. When it comes to giving birth to piglets, concentrate feed should be appropriately reduced to avoid mastitis and dry stool knot, so as to ensure that piglets can give birth smoothly.