I. Strict seed selection and selection 1. Hybrid parents used for breeding binary cross sows should have excellent reproductive performance. 2. Overcome the traditional seeding methods for seeing the mother and select the remaining dual sow body to meet the reproductive production requirements, with more than 7 pairs of effective nipples. Body condition should be healthy, all parts of the body develop normally. 3. The use of different boars for breeding of the same bi-wort sow has different reproductive effects. Therefore, it is necessary to select and match boars, formulate suitable matching schemes, promote the establishment of breeding registration cards, and prevent and avoid close parental breeding. Second, age-appropriate use, timely insemination, timely elimination 1, affected by a variety of factors, and some bisexual sows in the birth of two months of age appeared on the initial situation, this time the body is not mature, premature mating use, not easy to conceive, Can be pregnant, there are fewer litter size, and easy to accompanied by dystocia, affect reproductive performance and use of years. If the breeding is too late, the body will often be overweight, resulting in no obvious estrus, and difficulty in mating and conceiving. Binary sows are suitable for use between the ages of 4-5 months and have a body weight of approximately 50-60 kg. 2. The estrus symptoms of the two sows are not obvious in the local sow, but are not easily observed and judged. Accurate estrus identification is the key to timely insemination, in order to ensure the conception rate and the number of litters. We summarized the methods of heat detection for “one look, two counts, three listens, four press backs, and five comprehensivesâ€. If repeat insemination can be achieved, it will be beneficial to increase conception rate or litter size. Ensure that the input of semen qualified and effective, insemination volume 20-40mL, insemination operating procedures to strict specifications. 3. Timely replacement and replacement of unsuitable sows. Elimination type: no obvious estrus symptoms, long-term infertility, and no significant improvement in treatment; fewer litter size; fierce temperament, poor motherhood; aging, and gradually reduce the number of litter size; poor lactation performance, lack of hidden nipples Poor tolerance of sucking milk; poor performance of hybrid offspring; suffering from infectious diseases, suffering from other diseases, long-term cure. Third, scientific feeding, to meet nutritional needs to provide a comprehensive and balanced nutritional supply is to maintain the material basis of reproductive function. If nutrients are inadequate, unbalanced or surplus, their reproductive potential will not be able to function properly. Binary sows are large, bulimia, and are prone to deposit fat. They are poorly tolerant to hunger and must prevent excessive body fat or excessive body weight. 2. The amount of feeding should be such that the sow does not experience hunger. The adjustment of the proportion of the diet should be based on the sow's sorrow and the different physiological stages. Should take a sub-feeding: 1 after weaning, early pregnancy (21 days after mating), to make the recovery of sensation as soon as possible, poor sensation should adopt "short-term excellent feeding", supplement protein feed, to ensure timely estrus ovulation and embryonic normal development , reduce early embryonic death. 2 In the second trimester (after 80 days), attention should be paid to the intake of sufficient protein, especially animal protein, to the pregnant sow so as to meet the needs of the fetus for large amounts of deposited nutrients and weight gain. 3 In early parturition (one week before birth), it is appropriate to reduce the amount of feed. When the sow is lazy, feeding too much will affect the postpartum feed intake, resulting in decreased milk production and poor milk quality. 3, as long as possible to supply a certain amount of green succulent feed to meet the body's needs for vitamins. The correct use of vitamins and trace element additives, can not arbitrarily increase the amount of additives, but can not be used to replace fattening pig additives. Fourth, effectively prevent the occurrence of diseases, do a good job of childbirth care, to avoid reproductive function affected by the disease 1, after each breeding cycle weaning to estrus before mating, injection of "triple seedlings" for consolidation of epidemic prevention; do not use conventional "L-carbazole" and "Trichlorfon" deworming, select "avermectin" at the same time the body can send insects in addition to the body. In the spring and autumn every year, oral vaccinations are vaccinated. 2. The ternary sows produced by the binary sows are usually larger, and are prone to superficial genital tract injury and microbial infection during delivery, leading to obstetric diseases such as metritis, vaginitis, etc. Reproductive function is reduced or lost. Therefore, postpartum sows within 2-3 days, the daily injection of green streptomycin, streptomycin four or so, dystocia or serious damage to the sow must pay attention to continuous treatment, and promote the body to restore health. Fifth, timely weaning, shorten the period of breast-feeding, and increase the intensity of reproductive use. The binary sow has better lactation performance. The number of newborn pigs in the three-way piglets is large, and the long-term piglets are fast-feeding. The weight gain is obvious. Therefore, early feeding can be carried out at 7 days after the piglets are born, and gradually feeding to 23 -35-day-old mother and baby can be isolated. Six, the appropriate use of reproductive hormones, improve reproductive function, promote estrus ovulation. For sows with irritated postpartum, abnormal estrus, long or short estrus, and no obvious estrus symptoms, the choice of intramuscular injection of serotype 3 or diethylstilbestrol could improve mating effects. VII. Others 1. Strengthen the feeding and management, do a good job inside and outside the pig house, and remove the excreta and dirt daily. Use poisonous bacteria, quicklime or other disinfectant drugs on a regular basis for environmental disinfection. 2. The sow's temperament is slightly stronger than that of the local sow, and it is highly competitive. Long-term feeding on the same circle is not conducive to public opinion control and safe pregnancy, affecting the estrus breeding, pregnancy, easy to cause early embryonic death and reduced number of litters, so a single lap to keep better.
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