The anatomical characteristics of chickens impose more stringent requirements on the environment. Ammonia in chicks should not exceed 10 milligrams per cubic meter, and chickens should not exceed 15 milligrams; chickens in hydrogen sulfide should not exceed 2 milligrams; chicken should not exceed 10 milligrams; carbon dioxide should not exceed 1500 milligrams per cubic meter; malodorous dilution should not exceed 70. . The field and living areas outside the hen house are required to have a low content of the substance; in the house, no more than 4 milligrams of inhalable particulates are in the air; total suspended particulate matter does not exceed 8 milligrams per cubic meter; the number of microorganisms should be controlled at 250,000 per cubic meter. Below, dust in the air is an important carrier of bacteria.
In reality, many farmers neglect the physiological and anatomical characteristics of chickens and do not create good environmental conditions for the survival of chickens. Mainly manifested in: improper site selection of chicken farms, unreasonable construction of chicken houses, no scientific ventilation system, no emphasis on ventilation, no ventilation, no ventilation.
The chicken site is low-key and the environment is narrow. Some trees are planted in the forest or a large amount of trees are planted on the site, so that wind blows do not enter and harmful gases cannot be discharged. The distance between the houses is too narrow, the air flow does not flow well, and the windows are not set properly. There are no windows or skylights, the air does not form convection, there is no ventilation equipment or the installation is unreasonable; some fear that the chicken is cold and cannot be ventilated. (Do not forget that the chicken has feathers on it. It can be adjusted by the growth of feathers. Adaptation Changes in the outside temperature, there is no dead chickens, only the poor ventilation caused the death of chickens; some due to a ventilated disease and "a decade of fear of wells" no longer ventilated.
All of this makes the chicken living in anoxic environment for many years. The environment bacteria, such as ammonia gas, hydrogen sulfide gas, methane, carbon dioxide, etc., are seriously exceeding the standard. The pathogenic microorganisms in the outside world are not only easily invade the body and cause chicken disease, but also often have poor ventilation. Hypoxia, heart and lung function decline, blood oxygen deficiency, the body is in a pathological state, can not produce a good immune response to immunity.
After we ventilate, we often have respiratory episodes, which are attributed to this ventilation. This is not the case. It is often 2-3 days before the weather is warm or the weather is clear. It is a day when there is no wind. At this time, if we close the chicken house, the internal air does not circulate, the harmful gas in the chicken house exceeds the standard, pathogenic microorganisms can easily infiltrate into the body, and the disease is formed. The "latency period" is that when the weather is warm, the ventilation is not gradual, and there is a subsequent occurrence of respiratory disease. That is to say, the days without wind before the weather change is the "black sunday" of the chicken. Therefore, ventilation is one of the most important issues for chicken feeding and management.
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