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In winter, raising pigs by plastics in a warm greenhouse can effectively increase the temperature in the house (allowing the temperature to maintain more than 10°C), and the construction of a plastic greenhouse can be simple and easy. The choice of warm sheds is based on the choice of high-rise, dry leeward, sunny, well ventilated, convenient drainage and drainage, and quiet place construction. Old sheds can also be used for reconstruction. The size of the sheds should be determined according to the number of pigs. It is advisable that each pig should occupy 0.8 to 1 square meters of ground. The construction sheds of the warm sheds should face south to the south and be built with open walls on all sides. The ground should be made of concrete floor. The pig bar spans 5 to 6 meters and the length is 5 to 20 meters. At the time of construction, a wall of 1 to 1.2 meters high is built on the ground. The wall is made of steel bars, steel pipes or bamboo rafts to form a bow frame or herringbone. The roof is 2 to 2.5 meters above the ground, and the distance between rack and shelf is 0.5 to 0.8 meters. The frame is covered with ethylene without a drip film, and it can also be covered with a double plastic film. The film is covered with a plastic (cotton, hemp) mesh or cloth to protect the plastic film. The seam of the film should be hot and firm, and it must be tight on all sides. The film should all be placed in the corner. In the sunny place at the top of the greenhouse, a convenient opening and closing window should be provided. In the shed, iron bars, brick walls or cement rods should be used to form a number of pigsheds. Each pigshed has an area of ​​about 10 square meters, which can be single or double, leaving a one-meter-wide sidewalk left at the north end. Double columns stay in the middle. Straw, rice bran, rice husk, crushed rice straw and other beddings were spread on the inside of the pig bar for 30-40 cm. Warm house management 1, insulation. 1 At night and cold wind and snow days, roofs should be covered with straw insulation. 2 The breeding density can be appropriately increased to increase the calories generated by the pig body to increase the temperature. 3 warm feed, drink warm water, increase the temperature of the pig body, thereby increasing the temperature. 2, ventilation. It is very easy to make the air in the house dirty by raising pigs with plastics. Therefore, it is necessary to ventilate and ventilate air in time to discharge harmful gases such as ammonia gas and hydrogen sulfide. Ventilation and ventilation time should be determined according to the weather conditions. Rainy days and windy days, the ventilation time should be short, each time 10 to 20 minutes; sunny days can be slightly longer, to ventilation 1 or 2 times a day is appropriate. 3, do a good job of health. Every day, timely removal of fecal matter and residual water from the warm sheds is required. 4, regular disinfection. Before the arrival of the piglets, the pens should be thoroughly disinfected after the pigs are slaughtered.