The effect of organic and inorganic zinc source, used with lignocellulose or potato fiber, on microbiota composition, fermentation, and activity of enzymes involved in dietary fiber breakdown in the large intestine of pigs

•ZnGly stimulates growth of Clostridium herbivorans in the large intestine of pigs.•ZnGly increases total phenols concentration in the colon.•Potato fiber increases β-glucosidase activity in the colon.•Potato fiber stimulates Clostridium spp. in the proximal colon.