我国养殖业是以散养为主,在广大农村千家万户的小规模饲养是几千年传统习俗。散养户的家畜家禽安全卫生条件普遍较差,成为当前防治动物疾病的一大难题。不少养殖户禽舍甚至就建在家里,生活环境没有封闭与隔离,卫生标准极差,家畜家禽混养,个别家庭人、畜、禽同屋生活,给人和家畜 China’s aquaculture industry is based mainly on free-range farming, which is the traditional practice for thousands of years in small-scale rearing of families in vast rural areas. The safety and sanitation conditions of livestock and poultry in scattered households are generally poor, becoming a major challenge in the prevention and control of animal diseases. Many farmer’s poultry houses are even built at home. The living environment is not closed or isolated. There is a poor standard of hygiene. Livestock and poultry polyculture, individual family people, livestock and poultry living in the same house give people and livestock