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For pre-maturing sows, feeding 1 kg to 2 kg of high-quality feed 10 to 20 days before mating, can stimulate multiple ovulations of sows, thus producing at least one pig at the time of delivery. After sow mating, it is necessary to reduce the ration back to normal feeding, otherwise it will cause an increase in embryonic mortality. In short, the postpartum sow should not be too thin, otherwise it will delay the occurrence of heat, and the number of ovulation is also small, and it is not easy to become pregnant. On the contrary, do not make it too fat and cause no heat.
Improve the feeding and management of pregnant sows and increase the survival rate of embryos at the peak of embryonic death. The peak of the first embryo’s death is from 9 days to 13 days after mating, and the mortality rate is about 50%. Therefore, various stress factors during this period should be reduced as much as possible. Generally, the sows are kept in the original circling breeding manner within 3 weeks to 4 weeks after breeding. The second peak of death is about the third week after pregnancy, the mortality rate is about 30% to 40%, and attention should be paid to various stress and nutritional deficiency factors. In addition, the sow’s late pregnancy mortality rate is about 15%. Therefore, the nutrition of late sows should be strengthened.
The early mating of sows with early-maturing age is not only less productive, but also affects normal growth and development. Should be reached in weight, age, and estrus 2 to 3 times before breeding. For example, the introduced double-dual sow is about 12 months old and weighs 90 kg to 100 kg.
Timely mating of male and female sows is a key factor in determining whether a sow can conceive and have fewer children. Most sows have estrus 7 days after the weaning. Some healthy sows may have estrus 3 to 4 days after weaning. Therefore, it is best to start watching carefully 3 days after weaning. The estrus of the sow or the boar can be driven to the vicinity of the sow house, so that timely breeding. However, depending on the species, age, season, and temperature, the timing of breeding varies. Such as the introduction of the improved sow sow in the third day to 4 days after the onset of estrus, until the sow swollen vulva just began to subside, and the outflow of filamentous mucus (civil hanging line), press the sow hind legs stand still The best breeding period is when moving.
Early weaning of the piglet Weaning early can make the sow early estrus, early mating, and increase the number of births and the number of births of the sow. The specific approach is to choose to start a tuna at 7 days to 8 days of age, and at the age of 28 days, weaned weaning. Weaning sows will be transferred to empty space. The piglet is left in the original bar, eats the original baby pig feed and controls the material appropriately, and gradually changes the feed and keeps the table clean. The piglet is trained to excrete urine in a fixed place.
Attention should be paid to the miscarriage if the miscarriage sows are susceptible to miscarriage within 9 days to 13 days after mating and 21 days before delivery. Try to supply high-protein feed, minerals, vitamins, and other rich concentrates and green feeds. Avoid feeding frozen, deteriorating feeds, avoid overcrowding, biting, slipping, whipping, and scaring. During the entire pregnancy, care should be taken that feed ingredients and feed are not mildewed. Aflatoxin contained in mildew feed can easily cause stillbirth, miscarriage, and affect weight gain of the pig.
Comprehensive measures to increase sow fertility rate
The purpose of scientifically rearing sows is to allow normal estrus in sows, facilitate breeding and fertility, and increase number of births. Sows should be fed more green and juicy feed during the empty period so that the sows will maintain a medium sensation until they are bred. The principle of scientific feeding is: sows who are too fat are fed less concentrate and more green and juicy feeds are needed; sows that are too thin should strengthen their feeding and management, feed more concentrate and animal feed, and promote the recovery of sows as soon as possible.