MUC5AC and infection: In this study, the PO and T-NOS activity, NO content, and the expression levels of the propO, ALF, Lys, Muc-1, Muc-2, Muc-5AC, Muc-5B and Muc-19 genes were increased in the three RS groups, which suggested that dietary RS could improve the intestine mucin and antibacterial capacity of the host towards resisting pathogenic infection.