1. L-lysine salt: The chemical name of L-lysine is L-2,6-diaminoacetic acid, molecular formula: C5H14N2O2?HCL white crystal. Lysine is often the first or second restricted essential amino acid due to its high nutritional requirements and low levels of feed ingredients. The content of lysine in cereal feed is not high. Although the content of bean feed is high, soy cake or soybean meal as raw material for chicken feed is a by-product of processing. Lysine will reduce activity when it is heated or stored for a long time. Although there are many lysines in animal feed such as fishmeal, there are similar problems of inactivation. Thus, the lysine that can be utilized in the feed is only about 80% of the value obtained by chemical analysis. Antagonism between lysine and arginine is still present in the nutrition of lysine. Lysine is often added to the feed of broiler chickens to make it have a higher content, which tends to reduce the utilization of arginine, so it is necessary to supplement arginine at the same time. 3iY China Feed Industry Information Network - based on feed, serving animal husbandry

2, DL-methionine: is an optically active compound, divided into D type and L type. In chicken, L-form is easily absorbed by the intestinal wall. Type D is involved in the synthesis of proteins by enzymatic conversion to L-form. The industrially synthesized products are racemic compounds of L-form and D-form, which are white flakes or powder crystals with weak sulfur-containing compounds. Special odor, soluble in water, dilute acid and dilute alkali, slightly soluble in ethanol, insoluble in ether. Its 1% aqueous solution has a pH of 5.6-6.1. 3iY China Feed Industry Information Network - based on feed, serving animal husbandry