Some people do not attach much importance to empty sow rearing. They mistakenly believe that empty sows are not pregnant and breast-feeding. They can just feed them. It is not true that good breeding of empty sows can promote empty gilts to ovulate. To lay the material foundation for improving the conception rate and the number of litters. The following are specific measures for reference:
1, empty sows can be 3-5 first and 1 lap, according to size, strength, weight and thin group management, to reduce the fight for food fighting stress, group feed empty sows can promote estrus, easy for breeders and breeders to find estrus sows To facilitate boar trials.
2. The sows are appropriately reduced before and after weaning, and are fed 2.5-3.0 kg/d before mating. Feed is still used during lactation to encourage multiple ovulation of sows. For those sows who are weaned at the time of weaning, not only do not reduce the material before and after weaning, but also increase the amount of feeding so as to restore body condition as soon as possible so that the estrus can be bred in time.
3. The sows used to induce boars every day after weaning to stimulate heat, reduce the number of days from weaning to breeding, and increase the number of litters per year.
4. Under normal conditions, weaned sows generally start estrus within 4-7 days, and the rate of breeding can reach 90% in 7-14 days. For those sows that are not estrus at 14d after weaning, measures should be taken to improve the feeding and management, boar seizures, hormone treatment, and so on, so that the estrus breeding.
5. Timely elimination of long-term non-estrus, repeated infertility (no more than 3 consecutive regrowths without genital tract disease), genital disease, severe limb and foot disease, low fertility, and old sow supplemented with excellent gilts.
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