Empty sows' feeding and management points
The key to empty sow rearing and management is to maintain the normal breeding condition of the sow, so that the sow can estrus normally, ovulate, and timely fertilize and conceive.
1. Provide diets with higher nutritional levels and maintain a moderate degree of lyricism. If sows are too thin or too fat, they will show no estrus, low ovulation, weak egg viability and low fertility, and can easily cause sows to feel empty.
2. Use short-term superior feeding techniques to promote estrus and ovulation. Before 10 to 14 days of breeding, gilts increased the amount of material by about 0.5 kg on the basis of the amount of raw materials fed the day before, and stopped feeding after the breeding was completed; the production sows increased the amount of material by 0.4 kg on the basis of the original amount of feed. As the situation increases or decreases the amount of material.
3, group feeding, proper exercise, boar seduction. Generally, 4 to 5 heads per group stimulate each other to facilitate early estrus and breeding. The gilts can move freely for 2 to 3 hours a day. Using a trial boar to chase non-estrus sows or polygamy in male and female pigs can promote ovulation in non-estrus sows.
4, do a good job emptying sows estrus identification, in order to avoid leakage and cause a mismatch. Estrus identification methods are mainly based on estrus identification and boar test. In general, the sow shows precancerous climbs across other sows. The genital area enlarges. The vaginal mucous membrane is red and mucous. However, the boar crossover is not accepted (for 12 to 36 hours). During the middle of estrus, the sow presses and backs Standing still, ears erect, genital enlargement, vaginal mucous membrane was light red, mucus is thin and transparent, there is no sound in the mouth (to stand still). This is the best time for insemination. In late estrus, the sows tend to be stable, the genital area begins to contract, the vaginal mucous membrane is lavender, and the mucus is thick, and it is reluctant to accept the boar.
5, timely breeding. For gilts, the initial maternal age and weight of local hybrid sows are generally 7 to 7.5 months old and weigh 80 to 90 kilograms. The introduced varieties are suitable for 8 to 10 months of age and 110 to 120 kilograms in weight and age. . The best breeding time for estrus sows is in the middle of estrus. Breeding of semen semen by microscopic examination, sperm viability above 0.7 can be mated or artificial insemination.
6, treatment of reproductive tract diseases. When a sow suffers from a reproductive tract disease, especially a high-yielding sow, diagnosis and treatment should be promptly conducted. Under normal production conditions, sows that have not been estrus or have frequent regurgitation for a long period of time, and sows that use drugs for aphrodisiac and improve feeding management or who have had more than three inefficiencies should be eliminated in time. Sows generally have the highest number of 3-4 litters, reduced to 6 litters, and have poor litter performance. Such sows should be eliminated.
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