Effects Of Different Non-starch Polysaccharides Enzymes Preparations On Performance And Digestive Physiology Of Wheat-based Or Corn-based Diets For Broilers

Two experiments were conducted to investigate the effect of a multi-enzyme complex, containing xylanase and glucanase, supplementation in low energy corn-based diets or wheat-based diets on performance and gastrointestinal physiology of broiler chickens.Experiment1:Effects of Different Non-starch Polysaccharides Enzyme Preparations on Performance and Digestive Physiology of Broilers Fed Corn-based DietsA total of900COBB-500male broilers were randomly assigned to5treatments (10rep/tre,10chickes/rep):A positive control (PC) diet was formulated to be adequate in nutrients, and a negative control (NC) diet was formulated with a lower energy (NC,-270kJ/kg ME reduction) than PC. Other three treatments were added with three different kinds of multi-enzyme complexin the negative control. Enzyme1, enzyme2and enzyme3were respectively composed with different activity of xylanase and glucanase. The21-d BW and1～21d BWG were significantly decreased by10.4%and10.9%for NC diet but significantly increased by the addition of three kinds of enzymes in NC diet (P<0.05). The21-d BW and1-21d BWG were significantly increased by9.8%,1.1%,9.3%and10.3%,8.1%,9.8%for the chickes added enzyme1、enzyme2and enzyme3, respectively. The F/G in1～21d and1～42d were significantly increased by10.3%and4.4%for NC diet (P<0.05).The F/G inl～21d and in1-42d were significantly decreased by8.1%、8.9%.8.9%and by3.4%.3.5%.2.6%respectively with the addition of enzyme1. enzyme2and enzyme3, respectively (P<0.05). The relative weight of gizzard increased increased by NC but decreased by the addition of three kinds of enzymes. The21-d villus length of duodenum was tended to be improved with the addition of three kinds of NSP enzymes. The21-d crypt depth of ileum were tended to be decreased and the21-d V/C of ileum were tended to be increased with the addition of enzyme2and enzyme3. There was no significant difference in the42-d intestinal morphology, microbial populations in cacum and carcass traits for enzymes (P>0.05).The percentage of pectoralis muscles was significantly increased by the addition of enzyme1(P<0.05).Experiment2:Effects of Different Non-starch Polysaccharides Enzymes Preparation on Performance and Intestinal Physiology of Broilers fed Wheat-based DietsA total of900COBB-500male broilers were randomly assigned to5treatments (10rep/tre,10chickes/rep):A positive control(PC) diet was formulated to be adequate in nutrients, a negative control (NC) diet with a lower energy (-350kJ/kg ME reduction) and3further diets where enzyme1. enzyme2and enzyme3were added to the NC diet. Enzyme1、enzyme2and enzyme3were respectively composed with different activity of xylanase and glucanase. The results showed that there were no significant difference in BW、BWG,and AFI in1～21d,22～42d and1～42d for broilers (P>0.05), but the BW. BWG and AFI tended to be improved with the addition of three kinds of NSP enzymes. The F/G in1～21d,22-42d and1～42d were inereased by NC diet (P>0.05). The relative weight of jejunum and ileum at21d and42d were decreased by the addition of enzyme1and enzyme2,but the relative weight of cecum was significant improved (P>0.05). There was no significant difference in21-d and42-d intestine relative length and carcass traits for enzymes (P>0.05). The 21-d crypt depth of duodenum was significantly increased and jejunum was significantly decreased by the addition of three enzymesin the NC diet (P<0.05). With the addition of enzyme1and enzyme3, the42-d V/C of duodenum were increased, but the difference were not significant. There was no significant difference in number of microbial in caecum with the addition of enzymes (P>0.05)Conclusion:In conclusion, enzyme preparations improved performance of broiler in1～21d and feed conversion in corn-based diets by improving energy utilization and digestive physiology with the best results for enzyme1in NC diet. Enzyme preparations improved broiler feed conversion in wheat-based diets by improving energy utilization and digestive physiology with the best results for enzyme1in1～21d and the best results fou enzyme3in22-42d.In wheat-based diets,enzymes preparations were tended to be improved the performance of broiler chickens.