The present invention is isolated and purified from chitin, chitosan, chitosan, known as a functional new material of food, and chitin, chitosan by the enzymatic method of chitin, chitosan 2 to 10 degree of polymerization degree chitosan, chitosan oligosaccharides are prepared by the enzymatic method, Feed composition containing chitin and chitosan oligosaccharides for livestock, aquatic fish and fish, which can be expected to lower cholesterol, improve feed efficiency, improve meat and weight gain, and prevent diarrhea in relation to animal feed for swine and poultry farming To provide.
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