Why should disinfection be taken seriously when raising chickens in orchards?

Disinfection is the only means of killing viruses and pathogenic bacteria outside the chicken's body. After each batch of chickens is removed from the coop, thoroughly clear out the chicken manure. After the floor is washed, splash it with a 2 to 3% caustic soda solution for disinfection. For fumigation disinfection of the chicken house space, use 28 milliliters of formalin and 14 grams of potassium permanganate per cubic meter of space. The "all-in, all-out" system should likewise be adopted. After a batch of chickens is raised and the house is cleared, till the orchard ground to a depth of more than 20 cm, then splash the ground with quicklime or lime milk for disinfection in preparation for the next batch. It is best to build two chicken houses, disinfect them alternately, and keep the birds in divided plots. After three years of raising chickens in an orchard, the site should be changed so as to give the orchard site time for natural purification.