L-Lysine is an essential amino acid that animal must obtain from food. L-Lysine is primary restrictive amino acid, the main job for L-Lyasine is to participate in the compound and precipitation of protein; besides, it can boost the absorption and utilization of the metallic elements. As an environment friendly feed additive, L-Lysine can ensure the growth of the animal and reduce the protein level and cost in the diary ration at the same time.