PURPOSE: A natural feed additive for improving the immunity and antibiotic property of domestic animals is provided to enable users to obtain the additive having high stability by using natural ingredients. CONSTITUTION: A natural feed additive for improving the immunity and antibiotic property of domestic animals is obtained by the following steps: mixing 60-80 parts of chitosan-oligosaccharide powder by weight and 20-40 parts of red ginseng extract powder by weight； and hot-air drying the mixture at 70-100 deg for 8-12 hours.본 발명에 의하면 키토올리고당 및 홍삼 추출물을 혼합하여 제조되는 것을 특징으로 하는 면역 및 항균성 증강용 천연 사료 첨가제가 제공된다.
