Effect of Exogenous NSP Enzymes (Xylanase, β-glucanase and Cellulase) on Structure and Function of Digestive Tract in Growing Pig Fed Paddy-based Diets

Ninety Landrace ×Jia growing pigs with live weight of 35±0.40 kg were randomly allocatted into three groups, each of which was replicated three times with ten pigs per replicate. The pigs fed with either a conventional corn based diet group I (Control) or a paddy-based diet (group Ⅱ) or a paddy diet supplemented with 0.2% NSP enzymes (group Ⅲ). All pigs were given ad libitum access to both feed and water. The results of feeding experiment showed that supplementation of NSP enzymes significantly increased ADG by 8.78% (P0.05) and decreased F/G by 9.42% (P0.05) over group Ⅱ. No significant difference were found in ADG and F/G between control group Ⅰand the group Ⅲ. The digestive experiment showed that adding NSP enzymes significantly improved apparent digestibility of CP, EE and CF by 18.76% (P0.01), 16.04% ( P 0.05) and 108.57% (P0.05), respectively compared with group Ⅱ. The activities of proteolytic enzyme and α amylase in duodenal contents were increased by 99.07% (P0.01) and 18.41 (P0.05) with the addition of NSP enzymes. No significant differences between group Ⅲ and groupⅡ were found in activities of pepsin in the gastric content, the trypsin and lipase in duodenal contents, the disaccharidase and γ glutany transferase (γ GT) in intestinal mucosa, but there was a tendency towards higher activities associated with the NSP enzymes diet(P0.05).The lengths of the villi within the duodenal, jejunal and ileal sections of the small intestine of pigs receiving the NSP enzymes diet increased by 23.68% (P0.05), 56.00% (P0.01) and 76.90 % (P0.01) respectively, as compared with the pigs in groupⅡ.