During poultry breeding, many factors such as the accumulation of chicken manure, untimely cleaning, shacks, and high-temperature and high-humidity environment can easily produce a large amount of ammonia gas, which has high water solubility (1L water at 0 ℃) Soluble 907g) is often adsorbed on the chicken's skin, mucous membranes and ocular conjunctiva, thereby irritating it and causing various inflammations.