Lysine belongs to the group of essential limiting amino acids. It is found in all of the proteins but vegetable proteins contain its small amounts, thus feed mixtures are often poor in it. Lysine deficiency in the body is caused by poultry diets that consist mainly of cereals, sunflower meal and minor amounts (1–2 %) of animal feed. It contains two amino groups and one carboxyl group, therefore it has basic properties. Lysine is a component of proteins.
It is necessary for poultry for the regulation of nitrogen and carbohydrate metabolism, as well as for the synthesis of nucleotides and chromoproteins, it promotes intensive growth of younger animals, intensive use of feed, and melanin pigment formation in poultry feathers; lysine affects formation of erythrocytes and calcium deposition in bones, is involved in redox reactions, activates transamination and deamination of amino acids, facilitates calcium and phosphorus absorption.
Lysine is an amino acid of the second priority in poultry requiring methionine for the feather protein formation. Wheat, barley, and corn and sunflower diets are almost always poor in lysine.
L-Lysine monohydrochloride, is considered a vital amino acid needed to make proteins. This product is widely used in various sectors such as the drug and food industries. Addition to food has proven to be very beneficial because it increases appetite, promotes brain growth and strengthens the body. Also, it is known to increase resistance to disease and increase intelligence.