Choose good varieties - do a good job in breeding - control pregnant sows - conditioning piglets - select the well-plotted pigs - fast fattening pigs. Pigs have a "chain" nature, ignoring which part of the pigs are poorly maintained. As the saying goes, "The pigs are not coincidences, patient adjustments and careful care" are the most important. With scientific management and high-quality feed, pigs can be kept well. The selection of good breeds, including breeding boars and breeding sows, is the first step in breeding. It is related to biological and economic characteristics. Only those who have excellent quality are selected. When selecting seeds, in general, the following principles should be met: First, the production performance is good. It has high production capacity, high yield, good quality, low cost, strong utilization of feed, strong physical and beautiful appearance. The second is high fertility. There are well-developed sex organs, and the second sex is obvious. It can normally reproduce a large number of high-quality offspring and expand reproduction. The third is early maturity. Early maturation can reduce production costs and accelerate capital turnover for pigs. The fourth is strong adaptability. Adapt to the local soil, climate, natural conditions, with resistance to rough feeding and disease resistance. Fifth, it is healthy and fruitful. The physique is strong, can adapt to the local environment, has a high level of production, and can effectively exhibit various beneficial characteristics. After mastering the above principles, it is still necessary to comprehensively identify the breeder and then determine the quality of the breed. There are two basic principles of match selection in the matching process, homogenous matching and heterogeneous matching. Homogeneous selection, that is, in breeding herds, individuals with similar physical fitness, appearance, and production performance are selected for mating. The matching of the opposite sex allows the good characteristics of the male and the female to blend into each other, but the first-class sow must not be mated with the second-class boar because the mating of the female pig with the lower-grade male boar is bound to produce inferior offspring. The technical issues that should be noted in the selection: First, identify the kinship, if there is a close blood relationship (for example, the human blood refers to the mating taboo between the father and daughter, mother and son, brothers and sisters, and other father or sister brother.) Multi-fetal animals, pigs in the same nest are closer in blood than their brothers and sisters), and they must not be used except for fixing certain hereditary properties (pure breeds and some phenomena). The second is the physical appearance of the matching, male and female are solid can be equipped, on the contrary, too rough pigs to take out. The third is the matching of physiological characteristics, such as fecundity, lactation, precocity and adaptability. It is closely related to breeding. The same sow and 15 boars produce 15 pigs and 10 male pigs. The fourth is the matching of age. The heredity and viability of pigs vary with age. Young-age male and female sows are better than young or old-age male sows. General young and old-age male and female sows have more litter size and young age. Management of pregnant sows to manage the requirements of pregnant sows to ensure the normal development of embryos, can produce large quantities of large, strong and robust piglets. Within three to five days after sow pregnancy, fertilized eggs develop completely, relying on the nutrients of the egg cells themselves. As the fertilized egg moves toward the uterus, it forms the placenta. About 20 days is a crucial period for embryonic development. Special attention must be paid to management. At 3-4 months, the total embryo weight reached 90%, equal to half of the birth weight of piglets. According to the body condition of the sow during pregnancy, different feeding methods are adopted: Firstly, two pigs should be fed in the middle. This breeding method is suitable for the production of sows, 20-40 days in addition to feeding a large amount of green roughage should be fed part of the concentrate feed, and later on the green, rough feed. Beginning in three months, feed more concentrate. Should be higher than the beginning of pregnancy. The second is backgammon. This feeding method is suitable for sows that are born and sows that are bred during lactation. Both for the sow's own development, but also for the piglets' breastfeeding, according to the increase in the fetal weight and gradually increase to reach the highest nutritional level in the month before delivery. The third is the rough after the fine, this method of feeding, suitable for sows before mating with good condition of the sows, very small fetus in early pregnancy, to the late according to the needs of fetal growth and development, appropriate to feed part of the fine material. Conditioned piglets were divided into suckling piglets, weaned piglets and young pigs. First, in order to strive for full-blown piglets, it is imperative to strengthen management measures. First, the nipples are fixed, weak and fixed in front, and strong and fixed in the back, but they must be fixed immediately after birth. Lots of babies still need to help breast milk. Secondly, early feeding was conducted. Three days later, copper and iron (25 g of ferrous sulfate, 1 g of copper sulfate, and 1000 ml of water were sprinkled on the sow's nipple) were used to supplement the red clay, salt, charcoal, and water. Self-eating in the sink. After 10 days make up the paste mix (corn noodles, sorghum noodles, and broken rice noodles). The second is 45-60 days of piglets, weaning in batches, take the method of leaving the mother from the circle, regular breastfeeding, and gradually leave the mother's approach (three times, twice, once). Third, young pigs enter the breeding stage after weaning, and part of them are rearing pigs, and the other part is fattened. According to the operating options of the pig farms, the management of the two types of pigs is strengthened. The selected piglets were reared from the 4th month after birth to the early stage of initial allocation, and they were called reserve pigs. Usually picking small boars and gilts for seeding, fast growing, good growth, strong physique, no illness, good appearance, no serious shortcomings, more than 10 nipples, and evenly distributed weaned piglets Kind of use. Transferred to the reserve group, continue to observe and identify growth and health conditions. After every 1-2 months to identify once. Finally, the ideal small boars and gilts were selected and transferred to breeding herds. Fast fattening pig fast fattening method is the use of science and technology, strengthen feeding management, shorten the production cycle, increase commodity rates, reduce feed consumption, and strive to obtain the greatest economic benefits with the least human and material resources. In the application of fertilizer technology, there is a "one-stop" and "straight" method of fattening. According to the needs of the growth and development of pigs, better nutrients should be supplied throughout the feeding cycle so that the growth rate and feed utilization rate can be maintained at a high level. It is estimated that the weight of 20-90 kg stage, feeding 94 days, the daily gain of 1.5 kg, 1 kg per kg, consumption of fine material 3.05 kg, crude material 0.15 kg, green feed 0.84 kg. Practice has proved that the breeding of hybrid pigs, fast weight gain, provincial feed. (Heilongjiang Province Tieli Farm Li He)
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