L-Isoleucine is used in the production of premixes and compound feed, as well as to balance the diets of farm animals, including poultry, with isoleucine. The supplement is added to feed, compound feed, and premixes at feed mills and farm feed mills using existing step-mixing technologies. Application rates depend on the feed composition, animal species, and age and are determined in accordance with current amino acid application standards and technology in the Russian Federation.