Oligosaccharides which are straight or branched chain saccharides developed by 2-10 mono-saccharides have beneficial effect to animal intestine. Due to the nondigestible property, functional oligosaccharides can get to the animal intestine without decompounding. After that, oligosaccharides will be utilized as the optimized carbohydrate source by the healthy bacteria such as lactobacillus and bifidobacteria. In addition, it is reported that oligosaccharides can inhibit the adherence of pathogens and...