The present invention relates to: for enhancing an immune feed addictive, including silkworm, it is with improved antimicrobial peptide, and wherein feed addictive includes 1 to 50 components by silkworm weight, has the improved antimicrobial peptide relative to 100 components by feed addictive weight To its production method. By supplying feed addictive of the invention to domestic animal, the productivity of domestic animal is improved, and health can be kept, and harmful enteric bacteria can be suppressed, and immune to be controlled, the quality of livestock products can be improved. In addition, feed addictive of the invention is comparable or promotes antibiotic better than increasing, therefore it can be used as the natural novel antibiotic substitute for being added to supply.Copyright KIPO 2017
