Exogenous fibrolytic enzymes: Mechanism and its application in ruminants

Enzyme is the mainly product of secretion from bacterial and fungal microbial, which has high catalytic efficiency, high selectivity, non-toxic and harmless. It is of decisive significance to improve the feed conversion ration and reduce the cultivating costs on enzyme preparation supplementation in diets. Studies on enzyme preparation have mainly focused on non-ruminant animals, which the results shown that enzyme preparation supplementation in diets can significantly improve growth performance, nutrient digestibility and body immunity. Ruminants have the complex digestive system, which the mechanism of enzyme preparation supplementation in diets remain unclear, all these prevent the research progress in ruminal nutrition. This article reviewed the mechanism of action of enzyme preparations and its application in ruminant production, nutrient digestibility, ruminal fermentation and microbial flora, which aimed to provide references for the further research.