We pigers know that it's too cold and too hot for pigs. Now how can we control the damage caused by high temperatures to our pigs in the summer? First of all, what are the hazards of high temperatures to pigs? During the high temperature stress that persists in the summer, the body's breathing frequency and blood circulation are accelerated to promote heat dissipation. This regulation will increase the oxidation in the body, accelerate the decomposition of fats and proteins, increase the heat production, and there will be insufficient oxygen supply for breathing. Incomplete oxidation results in incomplete oxidation of metabolites in the body. Gastrointestinal peristalsis, gastric juice, intestinal fluid, secretion of pancreatic juice, hepatic glycogen production, etc. are destroyed, the function of gastrointestinal digestive enzymes and bactericidal ability are weakened, the resistance of the respiratory tract, the medullary canal and the detoxification function of the liver are weakened, and the resistance of breeding pigs Significantly reduced, body heat balance is destroyed, body temperature rises, and pigs become unconscious. This pathological phenomenon is called heat stroke disease, severe central nervous system disorders, severe cardiovascular system burden, heart failure and death. Effect of High Temperature on Fertility of Breeding Pigs When the ambient temperature is higher than 33-55°C and the boar's deep body temperature exceeds 40°C, the temperature of the testicles will increase. Semen quality is reduced, semen counts are reduced, and vigor is reduced. Poor quality semen can affect sow fertility. When the summer high temperature stress begins 7 to 14 days, the quality of the boar semen is reduced, and after 7 to 8 weeks of normal high temperature, the semen quality can return to normal. High temperatures can also reduce boar libido. High temperatures have a certain influence on the estrus, breeding, and pregnancy of sows. In the hot season, sows often show ecstasy and sympathy, and the estrus cycle is prolonged. High-temperature stress had the most severe effects on sows at 3 weeks before breeding, 3 weeks after mating, and 3 weeks before delivery. The reduced fertility of sows in hot climates is partly due to reduced conception rates and early embryonic death. Sows are particularly sensitive to high temperatures 1 to 3 weeks before and after mating, and their conception rate is significantly reduced. Embryonic early absorption and death occur, and the litter size is significantly reduced. Late pregnancy is the critical period for fetal weight gain. High temperatures can affect the normal development of the fetus. High temperatures reduce the intake of sows, resulting in poor nutrition. This results in low fetal birth weight and slow growth after birth. Sows suffer from heat stress in late pregnancy, sows have lower levels of immunoglobulins in their colostrum and regular milk. Piglets born at one day of age have significantly lower levels of immunoglobulins in the blood than normal piglets. Sow colostral sows The content of immune globulin in the piglet's blood is very important for the piglet's acquired immunity. When the piglet's content is low, it results in poor immunity of the piglet. Second, we must say countermeasures. In daily production, it is very important to adopt effective feeding and management measures to improve the environment of the pig house and create a suitable ambient temperature for the pig. The specific measures are as follows: 1. Increase dietary concentrations, especially energy, protein, and vitamin levels. In the high temperature environment, the feed intake of pigs decreases, while the production of heat in the body increases, so that the energy intake in the body is obviously insufficient. By increasing the dietary energy and concentration levels, heat stress can be appropriately relieved, and vitamin B and vitamin C can prevent heat stress. Have a certain effect. 2. Provide sufficient and cool drinking water for the pigs. At high temperatures, the amount of drinking water is greatly increased. In addition, spray can be applied to the body of the pig, showers and baths can be provided, ventilation fans can be installed to increase ventilation, and the heat of the pig body can be promoted. 3. Strengthen the shading, ventilation and heat insulation design of the pig house. 4. Summer feeding at low daily temperatures (such as morning or night), while increasing the amount of feeding. 5. Add anti-heat stress drugs, add electrolytic multidimensional, oral rehydration salts and other drugs in drinking water.
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