In winter, when farmers raise their livestock and poultry by heat preservation pens, litter, livestock and poultry excrement are rotted and decomposed under suitable conditions of temperature and humidity, and heating and heating with coal, and poor management result in large amounts of ammonia gas and vulcanization. Hydrogen, carbon monoxide and other harmful gases. These harmful gases are extremely harmful to livestock and poultry and can cause poisoning, illness or death in livestock and poultry. Elimination of harmful gases in homes can be achieved by the following measures: First, improve the environment within the homes, remove the leftovers, excrement and garbage in the house in time, and keep the house clean and dry. Second, when using coal and other heating, it is necessary to make the fuel fully burned, the smoke discharged smoothly, and there is no leakage of smoke or smoke. Ventilation holes are provided inside the house to prevent accumulation of carbon monoxide and increase in concentration. 3. Sprinkle a layer of superphosphate evenly on the inner (frame) surface of the poultry house every week. Spread an area of ​​5-10 birds to 0.5 kg to reduce the production of ammonia gas. Fourth, scientific treatment of litter, reduce ammonia production. There are three kinds of treatment methods: (1) Sulfur powder is mixed in the litter, and 5 kg per 10 m2 of mat is mixed; (2) Copper sulfate and quicklime are used to treat the litter; (3) Paddy ash and coal slag are mixed as litter. 5. When the temperature is high at noon, timely opening doors, windows, ventilation windows or plastic film for ventilation. The ventilation time is generally between 10:00 am and 2:00 pm, with ventilation for 10-20 minutes. 6. Hang a charcoal mesh bag in the livestock house, and charcoal will adsorb harmful gases in the air. VII. The livestock and poultry houses should be sterilized on a regular basis in winter, at least 3-4 times per month. Lime water disinfection is suitable in winter. Fresh lime can be used to make 10%-20% lime water, disinfection site, stucco walls, wooden columns and so on. China Agricultural Network Editor

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