The Effects of Xylanase and Multi- enzyme PS on the Production Performance,Digestibility and the Nutrient Ingredients of Muscles of Oreochromis niloticus

This study was conducted to evaluate the effect of xylanase and Multi-enzyme PS on Oreochromis niloticus.Oreochromis niloticus(32.65±4.16 g) were fed the basal diet supplemented with 0.05 %,0.10 %,0.15 % xylanase and 0.05 %,0.10 %,0.15 % Multi-enzyme PS,respectively.The trial lasted 60 days.Fish fed the diet containing xylanase from 0.05 % to 0.15 %,the growth performancet,he protein digestibility and nutrient utilization have been surveyed.The results showed that they fluctuated with ascending of xylanase,firstly upswing and then descended and 0.1 % was the optimal.With the density of the Multi-enzyme PS increasing,the results rose and when the density got to 0.15 %,the effect was not significant.In conclusion,the addition of xylanase or Multi-enzyme PS had significant positive effects on growth performance,the protein digestibility and nutrient utilization,but had no effect on fish muscle composition of Oreochromis niloticus.Inclusion of xylanase and Multi-enzyme from 0.10 % or 0.15 % might be sufficient for optimal performance of Oreochromis niloticus.