1. With the expansion of scale, the chicken battery cages and chicken houses have not considered the rational planning, and the brooding houses and youth houses are placed in the downwind position of the egg house or the distance is too close, resulting in no disease but no toxicity after immunization. Adult chickens are spread to the chickens and young chickens. There are also very close intervals between the chicken houses, which bring difficulties to light, ventilation and self-purification of the environment (the normal house spacing is 2-3 times the height, ensuring 9:00 am – 3:6 pm on the winter solstice day) The front wall of the chicken house is full of sunshine).
2. Chickens have higher requirements for oxygen and air quality than mammals such as humans. In order to save money, the laying hen house was built less than 2.8 meters (the distance between the chicken house floor and the front room, commonly known as “column head”); for the convenience of heat preservation, the brooding house was built lower. Due to poor air flow in the chicken house, respiratory diseases are frequently caused. In general, the egg house is preferably 3.2-3.5 meters, and the chicken house is not less than 2.8 meters in principle, so that the respiratory tract will be much less in the house. This phenomenon is common in China and can be seen everywhere.
3. Blindly imitating a fully enclosed modern chicken house with the appearance of a modern chicken house without the core facilities of a modern chicken farm. For example, blindly building an over-long chicken house of more than 100 meters, imitating others to install small windows that cannot be opened in the upper part of each house, but omitting other people’s side wind windows and corresponding horizontal wind turbines at low temperatures. In addition to the fan on one side, there is no other venting port and multi-level automatic ventilation system for temperature control. This can not open the large-power fan in the cold season. It is difficult to solve the air quality problem and make the flock easy. A respiratory tract has occurred. In this way, the chicken house not only loses the convenience of opening and opening the half-open house, but also loses the advantage of better isolation of the closed house and stable production performance of the flock. It is a “grave” of the egg.
4. In order to solve the problem of heatstroke prevention and cooling without installing the fan wet curtain, some people built the chicken house in the woods or planted a large number of tall trees around the chicken house. These trees not only attract birds that easily spread avian infectious diseases such as avian flu and Newcastle disease, but also prevent the birds from falling apart. They are a safe haven for many pathogenic microorganisms, making sunlight The bactericidal effect of ultraviolet rays and disinfectants is not exerted, and chicken farms are easily contaminated, and they cannot be purified for a long time after pollution, and the disease is entangled.