Summer temperatures are high, high temperature and heat prevention have become the focus of pig factories, especially in the south of the Yangtze River, the summer temperature above 30 ° C -35 ° C for up to 5-7 months. However, except for the piglets, the suitable temperature of all other types of pigs is below 24 ° C, and the continuous hot weather far exceeds the suitable temperature of the pig herd.

Hazards of high temperatures to pig farms:

High temperature caused by heat stress reaction to the amount of food damage: during the heat stress reaction, part of the excitement of the feeding management center is suppressed, while the digestive system is improved, the drinking water is improved, in order to accelerate heat exhaust, reduce heat accumulation, so that the amount of eating material is further reduced. Reducing the amount of food eaten is a defensive reflection of the small animals in maintaining the balance of human body heat in a high temperature natural environment. The amount of food eaten decreased by 1.6% per 1°C increase in the 21°C-30°C range and 4.6% per 1°C increase in the 30°C-38°C range.

The harm of high temperature to old sows and breeding pigs: when the working temperature is higher than 32-35 ° C, the deep basal body temperature of breeding boars is higher than 40 ° C, and the testicular temperature rises. With the decrease in semen quality, the male sperm count decreases, the charm decreases, and the low quality sperm night will endanger the number of litters of the old sow. After 7-14 days after the high temperature weather stress response, the quality of boar semen decreases, generally after the high temperature stress response 7-8 weeks, the semen night quality can be restored, the high temperature will continue to reduce the sexual desire of the breeding pig, and cause certain harm to the estrus period, mating and pregnancy of the old sow. Old sows often show boredom and resentry during high temperatures, and the estrus cycle increases. 3 weeks before mating, 3 weeks after mating and 3 weeks before delivery of pregnant women, the harm of high temperature to old sows is more serious.

Part of the reduced reproductive capacity of old sows in hot climates is due to lower litter yields and early embryo deaths. In about 1 to 3 weeks before and after mating, the old sow is sensitive to high temperatures, especially in the case of high temperatures, and its littering is significantly reduced, and the early embryo digestion, absorption and death occur, which in turn significantly reduces the number of litters. The end of pregnancy is the key period for the baby's weight increase, high temperature will endanger all the normal growth and development of the fetus, so that the old sow eats less material, the nutrient content is not enough, and then causes the fetal baby to be born to reduce the weight, and the growth retardation after birth. At the end of pregnancy, the human immunoglobulin component in the primary milk and regular milk of the old sow is low, the human immunoglobulin component in the blood night of the piglet is significantly lower than that of the normal piglet at the age of one day of birth, and the human immunoglobulin component in the primary milk and regular milk of the old sow is very critical to the acquired immunity of the piglet, and when its composition is low, it will cause the immunity of the piglet to decline.

In order to better prevent pigs from being signed and gently connected to the sweltering summer, the industry now chooses mobile environmental protection air conditioning, wet curtain negative pressure natural ventilation and other methods to reduce heat. The suitable temperature between the old sow and the piglet in the delivery room is very different, and the suitable temperature of the newborn piglet and the old sow is 30 °C-32 °C and 22 °C -24 °C respectively. Therefore, the de-heating of the waiting room and the feeding piglet looks more embarrassing: natural ventilation and cooling must have both old sows and piglets. At this stage, many applications of mobile environmental protection air conditioning in the industry have been able to properly deal with the above problems: the air vent of environmental protection air conditioning can reduce the temperature by 4-10 ° C, and the design scheme only takes into account the selection of accurate positioning to send air conditioning, so that the air outlet only blows cold air on the precise positioning bar of the old sow, and the piglets on the side of the theme activities are completely unaffected, and then the old sow specifies the significant results of heating environmental protection and energy saving. In addition, the actual effect of natural ventilation under negative pressure of the wet curtain is also very good, but the suitable temperature of the old sow and piglet should be balanced. Natural ventilation of negative pressure of water curtain can reduce the temperature by 4 °C-8 °C, which can make the old sow feel comfortable; In order to better prevent the piglets from getting cold, PVC partitions are set up in the old sow pen to avoid the cold air caused by poor natural ventilation. The old sow farm is best to pull the sow bed up, and the installation part of the cooling fan and the wet curtain is moderately raised, so that in the natural ventilation, the cold air can cross from the top of the piglet, and the temperature under the sow bed is relatively high, the old sow can choose to stand up and experience the strong cold air, and can also deal with this kind of temperature difference problem.

Guangdong Meishuo Energy Conservation and Environmental Protection Technology Co., Ltd. (hereinafter referred to as "Meishuo Wind") is a company dedicated to environmental space ventilation and cooling, energy-saving and environmental protection treatment equipment sales, engineering design, construction and maintenance "one-stop" service manufacturers, our company has a number of production, manufacturing, sales of industrial equipment alliance cooperation manufacturers in China, The company's main products are negative pressure fans, HVLS large fans, external fixed evaporative air coolers, mobile evaporative air coolers, evaporation cooling (wet curtain) water curtains, axial fans, kitchen fume purification equipment, environmental protection equipment, etc., the products are divided into household type, business type, industrial energy-saving type and other series, widely used in family hotels, factory workshops, greenhouse planting, animal husbandry and other public places.

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