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Non-digestible polysaccharides are of great significance to human and animal intestinal health. Cellulose, arabinoxylan, β -glucan and glucomannan were selected in the present study to investigate the fermentation characteristics and fiber-degrading enzyme kinetics by inoculating pig fecal microbiota in vitro. Our results showed that fermentation of arabinoxylan and β -glucan produced the highest amount of acetate and lactate, respectively. The abundance of Prevotella_9 was the highest in β -glucan group and positively correlated with lactate and acetate. Glucomannan fermentation produced the highest amount of butyrate, and the abundance of Lachnospiraceae_XPB_1014_group and Bacteroides were the lowest. A significant negative correlation was found between Lachnospiraceae_XPB_1014_group , Bacteroides and butyrate. Exo -β -1,4-xylanase had the highest activity at 24 h during arabinoxylan fermentation. The activity of β -glucosidase and β -mannosidase at 36 h were higher than those at 15 h in the glucomannan group. The abundance of Prevotella_9 was positively correlated with β -glucosidase while Lachnospiraceae_XPB_1014_group and Bacteroides were negatively correlated with β -xylosidase. Our findings demonstrated the β -glucan and arabinoxylan promote proliferation of Prevotella_9 , with the preference to secret β -glucosidase, β -mannosidase and the potential to produce lactate and acetate. Butyrate production can be improved by inhibiting the proliferation of Lachnospiraceae_XPB_1014_group and Bacteroides , which have the lack of potential to secret β -xylosidase.

In Vitro Fermentation Characteristics and Fiber-Degrading Enzyme Kinetics of Cellulose, Arabinoxylan, β-Glucan and Glucomannan by Pig Fecal Microbiota