Threonine is an amino acid that cannot be synthesized by animals, but is very needed. It can be used to precisely balance the amino acid composition of feeds, meet the needs of animal growth and maintenance, increase weight gain and lean meat rate, and reduce feed-to-meat ratio; it can improve amino acid digestibility. The low nutritional value of feed raw materials can improve the production performance of low-energy feed; it can reduce the crude protein level of the feed, improve the nitrogen utilization rate of the feed, and reduce the cost of feed; it can be used for the breeding and breeding of pigs, chickens, ducks and advanced aquatic products. L-threonine is a feed additive produced by using the principle of bioengineering, Chemicalbook uses corn starch and other raw materials through liquid submerged fermentation and refining. It can adjust the amino acid balance in the feed, promote growth, improve meat quality, improve the nutritional value of feed materials with low amino acid digestibility, and produce low-protein feed, which helps to save protein resources, reduce the cost of feed materials, and reduce livestock and poultry manure and urine. nitrogen content, ammonia concentration and release rate in livestock and poultry houses. Widely used to add piglet feed, breeding pig feed, broiler feed, shrimp feed and eel feed.