Unveiling the influence of adaptation time on xylanase and arabinoxylan-oligosaccharide efficacy: a study on nutrient digestibility, viscosity, and scanning electron microscopy in the small and large intestine of growing pigs fed insoluble fiber.

This study investigated the effects of xylanase and arabinoxylan-oligosaccharide supplementation on viscosity, nutrient and energy digestibility in growing pigs fed a high-fiber diet mainly composed of corn over three time periods. Twenty pigs were surgically fitted with cannula in their jejunum and ileum for sample collection. The pigs were randomly assigned to one of four dietary treatment groups: low-fiber control, high-fiber control, xylanase supplementation, and arabinoxylan-oligosaccharide supplementation. The results showed no significant differences in digesta viscosity among dietary treatments. However, there was an interaction between dietary treatment and time for the digestibility of dry matter, gross energy, and dietary fibers. Initially, xylanase did not impact digestibility, but it improved over time. Conversely, arabinoxylan-oligosaccharide initially improved digestibility but declined by the third period. Findings suggest that the efficacy of xylanase in enhancing nutrient and energy digestibility in pigs fed high-fiber diets may depend on the length of the adaptation period. Xylanase supplementation also demonstrated the potential to counteract the negative effects of high-fiber diets. Further research is needed to optimize the application of xylanase in swine production and determine the optimal conditions for its effectiveness.