First, the introduction of an excellent breeding system, the introduction of scientific breeding to breeding sows with good breeds and large size can increase the birth weight of piglets. During the matching process, reasonable heterosexual mating should be carried out to fully utilize the advantages of hybridization to prevent the male and female sized sows from mating with each other, so as to reduce the resistance and immunity of the piglets and increase the mortality rate.
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Second, to strengthen the feeding and management, to increase the birth weight (a) sows during pre-pregnancy (generally assigned to 80 days after pregnancy). The goal of this stage is to ensure that the sow has a complete nutrition, prevents miscarriage of the sow and promotes the development of the fetus. Proper feed stimulation 7 to 10 days before sowing can increase the number of ovulation of sows and increase the number of births, especially for the lean sows, the effect of “aphrodisiac supplementation†is better. In early pregnancy, sows increase their metabolism under the effect of hormones in the body, increase appetite, increase digestive capacity, and gain weight quickly. They need to be properly restricted to feed, otherwise the mother will be too fat, resulting in early miscarriage or reduced number of births. It will also result in difficult labor at delivery and reduced postpartum sow feed intake, reduced milk production, thus affecting piglet development. In pig management, we should pay attention to the two main peaks of embryonic death: First, 9 to 13 days after mating fertilized egg attachment period, susceptible to a variety of factors to make embryos die. Therefore, various stress factors for sows at this time should be minimized. In general, 3 to 4 weeks after breeding, the sows are kept in the original circling feeding mode. Second, the third week after mating, this period is the stage of embryonic organ formation, and it is also susceptible to death due to outside influence. Attention should be paid to various stress and nutritional deficiency factors.
(b) Sows during late pregnancy (81 to 114 days of pregnancy). The goal of this stage is to ensure that the sows are sufficiently nutritious so that the piglets produced are consistent and avoid producing weak ones. 60% to 70% of the piglet's primary weight comes from the rapid growth of the sow 30 to 40 days before its delivery. Therefore, the intake of nutrients in the late pregnancy of sows will directly affect the size of the fetus. As the sow's abdominal circumference gradually increases, the Digestive System is squeezed, and the daily feed intake will decrease, and the number of feedings needs to be increased to meet the actual needs of the sow. At the same time, this stage is also the stage where calcium, phosphorus and other minerals need the most. If the sow cannot be supplemented from the feed, calcium deficiency can easily occur, and limp and postpartum warts can occur, which affects the postpartum belt. Therefore, it is necessary to ensure adequate nutrition and give special care to sows with poor body condition. At the same time, it is necessary to ensure the fresh feed and the cleanliness of feed troughs and drinking fountains so as to prevent bacteria from being produced due to feed spoilage and affecting the health of pregnant sows and piglets. The energy level in sow feed should be appropriately increased. 60 days before sow delivery, 200 to 250 grams of animal fat or oil feed (5% to 8% of the diet) is fed daily, which can increase the milk fat percentage of colostrum and regular milk and increase energy storage in the fetus. It is good for piglets to survive.
How to increase the birth weight of piglets