Effects of Exogenous NSP Enzymes(Xylanase, β-glucanase and Cellulase) on Morphology and Functions of Digestive Tract in Growing Pigs Fed with Paddy-Based Diets

Ninety Landrace X Jia 35±0.40 kg weight growing pigs were randomly allotted to three treatments, each of which was replicated three times with ten pigs per replicate. The pigs were reared on either a conventional corn-based diet (control Ⅰ ) or a paddy-based diet (control Ⅱ ) or a paddy diet supplemented with 0.2% NSP enzymes (test group). All pigs were given ad libitum access to both feed and water. The results of feeding trial showed that supplementation of NSP enzymes significantly increased ADG by 8.78 % (P＜0.05) and decreased F/G by 9.42% (P＜0.05) over the control group Ⅱ. No significant differences were found in ADG and F/G between control group I and the test group. The digestive trial showed that adding NSP enzymes significantly improved apparent digestibility of CP, EE and CF by 18.76 (P＜0.01), 16.04 (P ＜0.05) and 108.57%(P＜0.05), respectively, compared to control Ⅱ. The activities of proteolytic enzyme and α-amylase in duodenal contents were increased by 99.07 (P＜0.01) and 18.41% (P＜0. 05) with the addition of NSP enzymes. No significant differences between test and control Ⅱ group were found in activities of the 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 (P＞0. 05). The lengths of the villi within the duodenal, jejunal and ileal sections of the small intestine of pigs receiving the NSP enzymes diet were increased by 23.68 (P＜0. 05), 56.00 (P＜0. 01)and 76.90%(P＜0.01) respectively, relative to the pigs in control Ⅱ.