Study On The Effects And Mechanisms Of Multienzyme Preparation On Performance In Piglets Fed Corn & Soybean Meal-based Diets

To study effects of multienzyme preparations on growth performance and approach the mechanism of growth promotion in weaned pigs. 240 PIC weaned pigs(35 d of age) were randomly allotted into 4 groups with 6 replicates. These pigs were used in a 30 d performance and digestibility trial four diets :controlⅠ,controlⅡand groups multienzyme preparations A with xylanase,β-glucanase, protease and amylase and multienzyme preparations B with xylanase andβ-glucanase supplemented on controlⅡ. Diets were formulated according to PIC nutrient needs of pigs and composed of corn , soybean meal, whey powder and fish meal et al. The Results showed that: There were no differences in ADFI among treatments ( P > 0.05). In the period of 35~50d of pigs , the piglets fed with multienzyme preparations A and B had 10.25% and 9.46% higher ADG and had 10.63%和14.38% lower F/G than those fed control dietary( P < 0.05).The Results showed that: There were no differences in ADG,ADFI and F/G among treatments in the period of 51~65d of pigs. Feeding enzyme could reduce the rates of loose bowel movements of pigs obviously.To study the effects of multienzyme preparations on nutrient utilization of weaned pigs. 24 PIC weaned pigs (50 d of age) were randomly allotted into 4 groups with 6 replicates. Multienzyme preparation A and B could increase the apparent digestibility of DM,CP and GE of dietary significantly( P < 0.05 ) ,and there were 3.41%,4.14%,3.37% and 2.12 %,7.88%,9.99% higher than control( P < 0.05 )。3 piglets of every treatments were killed to approach the mechanism of growth promotion of pigs when the feeding experiment was finished. The Results showed that: Feed multienzyme preparations A and B increased activities of trypsin, pepsase ,lipase and amylase in duodenum and jejunum (P < 0. 05), and the multienzyme preparation A was better than the multienzyme preparation B. Pigs fed with multienzyme preparations A and B had a lower crypt depth and higher villous height than control, and also had higher levels concentration of blood glucose, Feed multienzyme preparation A and B could inhibit the growth of harmful microbion and promote the growth of beneficial microbion( P < 0.05 ) .