The boar bears the pig breed improvement task in the pig production. It directly affects the overall reproduction performance of the pig and the completion of production tasks. Therefore, the scientific breeding and reasonable utilization of the boar is the best Prerequisites and guarantees for performance. Breeding management of boars The nutrition of the boar's diet should be comprehensive nutrition, good palatability, easy to digest, maintain high energy and protein levels, have sufficient calcium and phosphorus, while meeting the needs of its vitamin A, D, E and trace elements, so that Ensure that the boar has a strong sexual desire and good semen quality. The boar's diet must be properly balanced and balanced. The protein in the diet directly affects the quantity and quality of the boar semen. The protein content of the boar diet must be appropriate, and the protein in the adult boar or non-breeding boar should account for 12% of the protein in the boar. The protein content is not less than 14%. The diet should be guaranteed to have an appropriate amount of trace elements and vitamin additives. Dietary calcium and phosphorus ratio of 1.5:1 is appropriate, such as the lack of calcium and phosphorus in the diet is easy to reduce the quality of semen, affecting the breeding and conception rate. If the diet lacks vitamins A, D, E, etc., it will gradually make the boar testicular degeneration and atrophy, loss of libido, loss of reproductive ability. Therefore, it is recommended that the proportion of the boar's diet be 58% of corn, 18% of bran, 12% of soybean meal, and 12% of boar's special premix. The daily feeding amount of the boar is 2.5 kg per day during the non-breeding period, 3 kg during the breeding period, and the appropriate amount of carrot or high-quality green feed should be supplemented during the breeding period, and the eggs should be fed after the breeding or harvesting. -3 pieces. A sport with reasonable exercise can enhance the boar physique and increase the libido and sperm motility of boars. Each day after early feeding and in the evening, each exercise is performed once, and the exercise time is about 1 hour. Winter is at noon, and lack of exercise can seriously affect the ability to breed. The feeding of male boars should be quantified regularly, 3 kg daily, 2 times a day, allowing the pigs to freely drink water, and increase or decrease the amount according to the pig's breed, body weight, and breeding (seizure) times. Immunity The boars are immunized in strict accordance with the boar immunization procedures to prevent the occurrence of infectious diseases of boars and regular disinfection. The parasites in the boars are exterminated to ensure the health of boars. The hygienic housing for pig houses requires clean, hygienic, dry, warm and non-thievery style. The temperature management of the breeder is very important. Generally, the temperature in the house is required to be maintained in the range of 18°C-20°C. Feeding breeding boars in a single column can avoid cross-climbing and mutual interference, so as to maintain the tranquillity of the living environment and prevent abuse of masturbation. Brushing and hoofing often brush the pig body to keep the skin clean, promote blood circulation, reduce skin diseases and parasitic diseases, and also allow the boar to listen to discipline. The hooves of the boars should be frequently trimmed to avoid scratching the sows during breeding. Reasonable use of boars Appropriate-age breeding boars should be mated and utilized after maturity. Different species reach the age of maturation. Local breeds are generally between 8 months and 10 months of age, with body weight between 60 kg and 70 kg. It is better to start breeding at the age of 10 months to 12 months and the weight of 90 kg to 120 kg. Ensure that the fertility rate and breeding boar congener pigs should maintain a reasonable ratio of males to females. The proportion of males and females in the present case is 1:25-1:30, and the ratio of male to female is 1:200-1:300 in case of artificial insemination. Regular inspection of semen quality Semen boars are subject to microscopic examination each time the semen is harvested. The male boar can check the quality of the semen twice a month. It is advisable to check once a week at the peak of the breeding period. Once the semen quality problems occur, immediately. Disable and find the reason and deal with it in time. In the case of artificial insemination, the viability and density of sperm must be checked before each insemination, and semen with a sperm activity below 0.6 cannot be used for insemination. To reasonably grasp the breeding intensity of boars, young male boars between 1 and 2 years of age are bred twice to 3 times a week, and boars in the prime can be used once or twice a day. The breeding peaks can be bred twice a day, sooner or later. With 1 time, continuous breeding 4 days - 6 days, rest 1 day. If it is a young boar that collects sperm, pick it up twice a week. The adult boar will pick it once a day, and the old boar will pick it once a week. Breeding boar breeding boar most suitable breeding age of 2 years -4 years old, this period is the best time for breeding; to timely retire the old boar and breeding boar selection.
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