Scientific breeding Carefully selected excellent boar species: selected male boars with body weights that are in line with the standard, without limbs disease, testis symmetry, obvious male characteristics, rapid sexual reflexes, and good physical and health status, are used for breeding and are based on boar semen As a result of the test, boars with high semen volume, high sperm density, and high sperm viability were selected. After ageing boars have been eliminated, they will be replaced or replaced by excellent young boars. Adjust diet formula: properly reduce the carbohydrate content of feed, add 2% to 5% of the fat in the feed, such as feeding two eggs per head per day or feeding 0.25 kg of small fish (boiled soup). Adding 200-500 mg vitamin C and 200 mg vitamin E per kilogram of feed can reduce cortisol levels in pigs during heat stress and improve immunity. The Chinese herbal medicines such as hawthorn, atractylodes rhizome, dried tangerine peel, betel nut, astragalus membranaceus, daqu, etc., which are used for heat-removing and heat-releasing, are formulated as feed additives, which can relieve the heat stress of breeding pigs. The environment is cooled by conventional methods: The breeder is tall and spacious, and the roof insulation layer is thickened; the outer wall of the wall is painted with lime, and tall trees and loofahs, pumpkins and other vines are planted around the pig farm and the pig house for shading. , Install exhaust fans, ventilation fans and other equipment, strengthen ventilation and ventilation to promote the heat of the pig body. Use a hose or sprayer to spray the water on the pig body and roof at regular intervals or reduce the temperature manually. Use wet curtain to reduce temperature, when the wet curtain thickness is 12 cm, the curtain wind speed is 1 ~ 1.2 meters per second, the wet curtain cooling efficiency is 81% ~ 87%, can reduce the temperature 5 ~ 8 °C, the greater the temperature The better the cooling effect. In addition, the supply of breeding pigs with sufficient clean cold water or well water to cool the boar testicles is also an effective means to reduce the impact of high temperature on its reproduction. Construction of a constant-temperature pig house: Select to renovate the pig house according to the number of breeding pigs before entering the summer. The inside of the pig house is insulated by ceilings. All aluminum doors and windows are used above and below the front door and wall. Window ventilation. Two 1000W water-cooled air conditioners are installed on the east and west sides of the house, and two exhaust fans are provided. When designing and producing a kind of boar, each cage is 2.2 meters long and 1 meter wide. The trough is equipped with a feeding trough and an automatic drinking fountain on the south side. Cage door. The slatted cement prefabricated panels were installed in the cages. The sewers were excavated under the panels with a gradient of 30 degrees. The sewage was discharged into the external digesters through the sewers. A sperm collection room is located on the east side of the house and is separated from the laboratory by aluminum alloy glazing. When the outside temperature exceeds 30°C, the water-cooled air conditioner is started and the indoor temperature can be maintained at about 25°C. Adjust the feeding, exercise time summer feeding pig breakfast can be around 7 o'clock in the morning, dinner should be around 6 o'clock in the evening. The wet mix can be more moist and fed with green feed to improve palatability. Each day, 0.5 to 1 hour of expulsion exercise was performed after early feeding and before feeding. Doing a good job of prevention and control of the epidemic in the summer, with high temperature and high humidity, the pathogenic microorganisms are prone to breeding, and the heat stress reaction will induce some hyperthermia diseases to affect semen quality. Therefore, attention should be paid to the environmental sanitation of breeding boars during the summer hot season. Remove leftovers in time to prevent feed moldy and spoilage; brush sinks and drinking fountains on a regular basis; remove manure in a timely manner to keep the room dry and ventilated; regularly spray insecticides on pig house walls, playgrounds, and sperm collection rooms to eliminate mosquitoes and flies; Disinfectant drugs, alternating spray disinfection; tools and work clothes should also be cleaned and disinfected on time to avoid cross-infection; pig farms should strictly carry out swine fever, foot-and-mouth disease, pseudorabies, parvovirus, Japanese encephalitis, brucellosis, etc. Immunization and insect repellent work in spring and autumn. At the same time, attention should be paid to the effect of some drugs such as sulfa drugs and trichlorfon on semen quality in the prevention of boars and treatment of boars, and Chinese herbal medicine should be used instead. Stevia Rebaudioside D,which is a glycoside. 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