When breeding, in order to prevent the invasion of pathogens, it is necessary to avoid reference by outsiders. There must be a disinfection tank in each breeding area, and the disinfectant must be replaced regularly. Staff should also pay attention to disinfection when entering the farm. In particular, some foreign personnel and vehicles are not allowed to enter and leave at will to prevent the carrying of germs. Must be thoroughly disinfected before entering to create a sterile breeding environment.