Ammonia is a colorless gas with strong pungent odor. The sources of ammonia in livestock and poultry houses mainly include two aspects: first, ammonia in gastrointestinal tract comes from feces, urine and gastrointestinal digests. Urinary nitrogen mainly exists in the form of urea, which is easy to be hydrolyzed by urease to produce ammonia. On the other hand, it is produced by decomposing the through the corruption of organic substances such as accumulated feces and urine, feed residues and bedding grass. When the padding is wet, the pH is appropriate, the temperature is high, there are many faeces and the air circulation is not smooth, the production of ammonia is faster. The concentration of ammonia in livestock and poultry houses depends on the temperature, feeding density, ventilation, ground structure, feeding management level, fecal pollution removal, etc. Because ammonia is easily soluble in water, the concentration of ammonia is relatively high when the humidity of the enclosure is high.
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