1. The temperature of chicken coops is generally kept at 13℃~23℃, not lower than 8℃ in winter and not higher than 28℃ in summer. If the temperature exceeds the upper limit, egg production will be obviously affected. Temperature factors can affect egg production. If sudden changes will cause stress response of laying hens, not only will egg production performance decrease, but also normal immune mechanism will be destroyed and disease resistance will be reduced.
2. The relative humidity in the chicken coop shall not be less than 40% nor more than 70%. Under the condition of high temperature, the chicken will have difficulty in heat dissipation and breathing, the utensils in the chicken house will be moist and the excrement will stink, while under low temperature, the heat dissipation in the chicken house will increase, intensifying the cold effect, not only affecting the egg production, but also easily inducing various diseases.
3. The lack of oxygen in the chicken house makes the appetite of the chicken decrease, resulting in insufficient nutrition in the body, stunted growth and development of the chicken, and decreased egg production of the adult chicken. In order to obtain excellent egg laying performance, it is necessary to maintain appropriate temperature and humidity. Ventilation, on the one hand, promotes the heat dissipation of chicken body; Secondly, a certain airflow speed can reduce the excessively high temperature in the chicken coop and eliminate carbon dioxide and other harmful gases.
Relationship between temperature and ventilation. When the temperature of the chicken house is higher than the normal temperature, the function of ventilation is to adjust the body temperature of the chicken by means of the air flow speed, and to increase the ventilation volume as the external temperature increases. However, when the temperature in the house is higher than 28℃, the wet curtain cooling system should be turned on while ventilation is increased. Air flow cooled by wet curtain can reduce the temperature of chicken coop by 4℃~8℃. When the temperature of the chicken coop is low, the purpose of ventilation is to replace fresh air, which requires both heat preservation and ventilation. In order to solve this contradiction, automatic ventilation equipment can be used. The equipment can give appropriate ventilation volume on the premise of monitoring temperature. It can give consideration to heat preservation, and at the same time, it can carry out ventilation timely, so that the chickens can obtain a more comfortable feeling.
The relationship between ventilation and humidity. In case of high summer temperature, the ventilation should be increased to reduce the shed temperature. At the same time, the larger air velocity takes away excess water, so the relative humidity in the chicken coop is generally more appropriate. In the cold season, in order to keep warm, the ground stove is used in the chicken coop, which, together with a small ventilation volume, makes the humidity of the chicken coop smaller and is easy to induce respiratory diseases. To this end, the humidity in the chicken coop can be better improved by sprinkling water on the ground and installing a small water tank on the furnace head of the oven. After the water in the water tank boils, water vapor enters the poultry farming equipment.