Threonine is a powdered or granular solid product obtained from liquid glucose as a raw material through microbial fermentation and extraction. As a feed additive, it is an amino acid necessary for the normal growth of livestock and poultry and other animals, and it is also one of the most easily lacking restrictive amino acids in the diet. It occupies a very important position in the immune system of livestock and poultry, and can promote the body's antibody and plasma IgG. Generate and increase animal immunity. It is widely used to add piglet feed, breeding pig feed, broiler feed, prawn feed and eel feed, etc.