Feed additive liquid mannaanse mannanase enzyme is a Hemi-cellulase; shear degradation of β-1, 4 glycosidic bond . The non-reducing terminal of degradation products is mannose. Products Function 1, chyme viscosity is reduced, digestion and absorption of nutrients increases through decomposition of mannan, etc non-starch polysaccharides. 2, degradation of mannan polysaccharide and lipid and protein complex formation to enhance the absorption of fat, can increase the feed value of raw materials; 3 elimination of combination of non-mannan-starch polysaccharides ,digestive enzymes and bile salt , thus improving digestion enzyme activity; 4, degradation of mannan, breaking cell wall, releasing nutrients which contact with digestive enzymes to enhance nutritional value of feed; 5, the degradation products of mannan is mannose oligosaccharides; it can reduce the pathogenic bacteria in the gut colonization, thus protecting integrity of intestinal mucosa; significantly promoting the proliferation of bacteria represented by bifidobacteria in animal intestinal and reducing the occurrence of diarrhea, and ultimately improve the performance of animal production