In the early stages of economic development, animal husbandry often manifested as a sideline of crop production, known as "backyard animal husbandry". With the development of the economy, it has gradually become a relatively independent industry in certain sectors. For example: egg laying industry, broiler industry, dairy industry, beef industry, pig farming industry, etc. After 40 years of development, especially after the Third Plenary Session of the 11th Central Committee of the CPC, China's animal husbandry output value accounted for 26.6% of the total agricultural output value in 1990. With the emergence of relatively independent animal husbandry industry, a strong industrial sector has begun to differentiate, which is the various animal husbandry input industries that serve animal husbandry and production, including the production of machinery, equipment, veterinary drugs, compound feed, and the processing of various animal husbandry products, such as meat processing industry, dairy processing industry, etc. Therefore, the broad concept of animal husbandry often includes agricultural and industrial joint ventures that serve it, such as various breeding and livestock companies, animal husbandry and industrial joint ventures, and compound feed companies. Many developed countries in the world, regardless of their land area and population density, have well-developed animal husbandry. Except for Japan, the output value of animal husbandry accounts for more than 50% of the total agricultural output value, such as 60% in the United States, 70% in the United Kingdom, and 80% -90% in some Nordic countries. Since the 1980s, the growth rate of animal husbandry production in China has far exceeded the world average, and the per capita output or value of animal husbandry is still lower than the world average. The main ways to develop animal husbandry include: adjusting the structure of animal husbandry according to local conditions, opening up feed sources, improving animal breeds, strengthening feeding management, preventing diseases, and improving the productivity of unit livestock; Simultaneously increasing the number of livestock.