The ability of sows to reproduce is affected by nutritional factors. Therefore, sow nutrition should be guaranteed at all stages.
1. Empty sow. The green and succulent feed is rich in protein, vitamins, and minerals. Feeding 4 to 10 kilograms per day has a good effect on increasing the number of ovulated eggs and improving the quality of eggs. Tests have shown that sows injected with 200 mg of β-carotene or 50,000 units of vitamin A palmitate at the time of weaning, on the day of mating and within 7 days of mating, can significantly increase the survival rate of newborn piglets; 0.2 per ton of feed added Chromium can increase the total number of litter size and surviving piglets by more than 20%. Empty boar sows should be appropriate, over-fat should be limited feeding, too thin should be short-term excellent feeding, improve nutrition levels 10 to 14 days before mating. Sows are kept at 70% and 80% ovulation, and they have a large number of ovulations, most likely to stimulate reproductive potential.
2. Pregnant sows. The protein in the diet of pregnant sows should reach 14%, but the sow should not immediately raise the nutritional level after mating, and the high level of the early pregnancy can make the survival rate of the embryo drop by 5%, among which 1-3 days after the breeding is particularly important. Supplementing folic acid in sow diets has a significant effect on litter size and survival of newborn piglets, especially when folic acid is low in feeds. According to experiments, supplementing 1 gram of folic acid per ton diet will increase sows’ total litter size and number of surviving pups by 9%. Soybean flavone can increase fecundity. Pregnant sows add 5 mg of daidzein per kilogram of feed and postpartum lactation can increase by more than 10%. Pregnancy sows have strong appetite, but overfeeding often leads to reduced feed intake during lactation. Therefore, do not allow sows to overfeed during pregnancy.
3. Nursing sows. The dietary protein requirement for sows during lactation is 14%. Sufficient lysine in the diet of lactating sows can reduce sow weight loss, improve piglet survival and litter weight, and have poor appetite in the first and second parity sows. The lysine content in the diet should be 1.2%. ~1.3%, after each parity is 0.95%, the ratio of valine to lysine should reach 1:1.28. During the hot season, adding 2% to 3% of fat or fat powder to the nursing sow's feed can improve feed palatability, increase sow feed intake, and ensure that the sow's intake of sufficient energy to meet the needs of lactation. The body condition of sows at the time of mating has a lot to do with feeding during lactation. Excessive body weight loss during sow-feeding will lead to delayed or irritated estrus and reduced fertility, especially for primiparous sows. Therefore, after one week of delivery, nursing sows should be free to feed, and during the entire lactation period, an adequate supply of dietary supplies is guaranteed.
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