When some farmers use feed additives, they always think that the more the amount, the better the effect. However, practice has proved that when most of the feed additives are used too much, they will not only be harmful to the livestock and poultry, but also will make the livestock and poultry sick and inhibit growth; the severe ones will cause death and cause significant economic losses. As one of the important ones, how to add feed grade L lysine hydrochloride to the feed?