1. Harmful gases: The most harmful gas to chickens is ammonia, which can stimulate the sense organs of chickens, induce respiratory diseases, and reduce feed efficiency. When smelling ammonia when entering a chicken house, ammonia gas in the house has been exceeded. Houses warmed with coal stoves should beware of carbon monoxide poisoning. When the harmful gas is excessive, corresponding measures should be taken immediately, such as increasing the ventilation volume, replacing the litter, etc., so as to reduce and eliminate the harm to chickens. 2. Cold insulation: The suitable temperature for laying eggs for hens is about 20°C, and the minimum temperature should not be lower than 13°C. If the indoor temperature does not meet the requirements, the temperature difference is too large, it is necessary to artificially add heat to increase temperature, and try to remain relatively stable. 3. Ventilation and ventilation: Especially in the case of low winter temperatures, people tend to notice only warmth and neglect ventilation. When the air in the house is relatively dirty, if it is necessary to increase the ventilation, it should be gradually increased, preferably at a high temperature at noon, and each ventilation time is shorter, and the method of multiple passages is better. If the chicken is found to be snoring and breathing slightly, the house is full of dust and smells, indicating that the air in the house is extremely dirty and ventilation should be strengthened immediately. However, in order to prevent the thieves from getting windy, it is generally difficult to set up elbow-type ventilators on the walls of the lee side to prevent the birds from being directly affected by the wind. 4. Humidity: Relative humidity should be 60% to 70%. Higher humidity is beneficial to the survival and reproduction of microorganisms. If accompanied by low temperature, it will increase the hazard of low temperature. When the humidity is low, the chicken house is dry and it is easy to induce respiratory diseases in chickens. Especially when the chicks are in a dry environment for a long time, they can cause dehydration and dehydration. Therefore, we must pay attention to the adjustment of the humidity of the shed. Winter litter is relatively dry, and it is often sprayed or spray-disinfected.
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