Effects Of Different Complex Enzyme Preparations On The Growth Performance,Fecal Viscisity And Microflora Of Broilers

This experiment was conducted to study the effect of six complex enzyme in corn-miscellaneousdiets on growth performance, fecal viscisity, fecal microflora of broilers. Six hundred and Forty1-day-old Arbor Acres broiler chicks were randomly divided into8treatments with8replicates, and10broilers in each replicate. The broilers of1st and2nd for the non-enzyme control treatments were fed acorn-soybean diet and low-energy corn-miscellaneous diet (-50kcal ME/kg)，3rd-8th for the enzymecombination group were added respectively with six enzymes A, B, C, D, E, F (each enzyme consistedof different levels of xylanase, β-glucanase, cellulase, mannanase, and pectinase)150g/t (full feed) inthe basal low-energy corn miscellaneous diet (-50kcal ME/kg). The experiment lasted for21days. Theresults showed that：The feed intake of broilers fed treatment7was significantly higher than those fed corn-soybeandiets and low-energy corn miscellaneous diet(P<0.05), and increased by15.3%,8.1%, respectively. Theweight gain of broilers fed fed treatment7was significantly higher than those fed corn-soybean dietsand low-energy corn miscellaneous diet(P<0.05), and increased by18.4%,19.3%, respectively.The Feedto Gain of broilers fed treatment7was the best, but all treatments added enzyme and non-enzymetreatments were no significant difference (P>0.05).There were a linear correlation between the viscosityof fresh fecal and the content level of mannanase and pectinase; With the addition he content level ofthe mannanase and pectinase, a downward trend in the viscosity of fresh fecal; the similar relationshipwere calculated between the moisture content and the content level of glucanase and cellulose.The fecalE.coli and aerobic bacteria of broilers fed added enzyme diets were significant difference with those fedtwo control treatments (P<0.05). It was demonstrated that the intestinal flora could be changed because of the degradation of the NSP substrate in diets by enzymes. The fecal moisture of broilers were alsoaffected.The results indicated that the optimum performance for broiler could be got by fed cornmiscellaneous diets supplemented with enzyme preparation E (150g/t, full feed).