After the summer solstice, the weather is getting hotter and hotter. Excessive temperatures can damage the heat balance of the pig, cause heat stress, reduce the body's immune system, and induce multiple diseases. Especially when the pigs are in poor health or in sub-health status, the possibility of outbreaks is even greater. If the air temperature is too high, the appetite of the pigs will be reduced and the feed intake will be reduced. Although the digestive rate may be slightly increased, Far from compensating for losses caused by reduced feed intake. Therefore, we must try to improve the current environment in order to facilitate pig rearing.
Reducing the temperature in the pig house requires a good thermal insulation performance of the roof, walls and pigsty. For this purpose, rooftops should be constructed of construction materials with low thermal conductivity so that heat radiation cannot pass through the roof; roofs can be in the form of canopies, with the use of intermediate air to block heat and radiation; and ceilings can be replaced with roofs for ventilation. It also has air inlets and air outlets to reduce the heat radiation to the pig house. Walls can be made of materials with good thermal insulation properties, such as hollow bricks and aerated concrete blocks. The thermal insulation of the barn ground is also very important because most of the pigs spend their time lying on the ground and 20% of their body heat is emitted. Grounds with insulating properties, such as insulated concrete floors or slatted floors, help reduce heat stress. At the same time, planting trees and building awnings next to pig houses can also effectively reduce heat radiation and significantly reduce indoor temperatures.
Strengthen the ventilation of the pig house through the natural ventilation can take away some of the heat inside the house. To achieve a good natural ventilation, keep a proper distance between the pig houses, this distance is generally 3 to 5 times the height of the eaves, the pig house must have sufficient air inlet and exhaust outlet. In addition, there should be skylights and windows. However, when the interior temperature is lower than the outside temperature, it is not possible to carry away the internal heat only by the natural ventilation so that the internal temperature can be further reduced. A proper air flow must be formed around the pig body in order to promote the evaporation and heat dissipation of the pig body. At this time, fans can be used to enhance ventilation.
Cold water cooling Cooling Cold water cooling includes spray cooling and wet curtain cooling. At the same time, cooling can increase the humidity inside. Spraying in the house reduces the temperature, usually spraying for 2 minutes every 10 to 30 minutes, and the temperature can be reduced by 2°C to 3°C. The spray must be used with a fan to achieve the desired effect. Wet curtain cooling method can reduce the temperature within 5°C～7°C. Cold air cooling is the air entering the pig house is pre-cooled by cold water, ice, dry ice and other refrigeration to make sealed containers cold and reduce the temperature inside, but will not increase the humidity inside the house. In addition, cooling methods using heat exchange between soil and air can also be used to allow air to pass through underground tunnels or cooling pipes before entering the premises. The cooling effect is related to the length, depth, thermal conductivity, ventilation velocity, and soil properties of the pipeline.
Improve the feed intake of pigs Under the premise of ensuring the full price and palatability of feeds, appropriately increase the concentration of nutrients in diets, add oils, amino acids, vitamins and minerals to diets; add heat stress resistance Substances, such as vitamin C and baking soda, etc.; promote the feeding of wet mixes, not mixing too much at a time, clean the leftovers in the trough to avoid rancidity and deterioration of the leftovers; properly reduce the stocking density.
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