EFFECTS OF ENZYME COCKTAILS ON APPARENT METABOLISABLE ENERGY CONTENT OF RICE HUSK WITH POULTRY

Abstract

A feeding trial was conducted to compare the effects of cocktails of enzymes and individual enzymes on metabolisable energy value of rice husk using cockerel. Three exogenous enzymes were used in a completely randomized design comprising of eight treatments with three replicates per treatment and one adult cockerel per replicate. The treatments were a control(rice husk with no enzyme), rice husk with either a xylanase , a multipurpose enzyme, a phytase, cocktail of xylanase and phytase, cocktail of xylanase and multipurpose, cocktail of phytase and multipurpose or cocktail of xylanase, phytase and multipurpose. The feeding trial was done using intubation procedure. Gross energy was determined using Gallenkamp ballistic calorimeter while apparent metabolisable energy was calculated. Values of apparent metabolisable energy were analyzed using the Statistical Analysis System while treatment means were separated using Duncan
Multiple Range Test. Enzymes, individually and as cocktails, significantly increased the metabolisable energy of rice husk compared to the control except phytase enzyme which effect was not significantly different from the control. There were significant differences (p˂0.05) between the individual enzymes in their effects on metabolisable energy. Cocktail of the three enzymes was significantly highest (p˂0.05) among the treatments in their effects on metabolisable energy while the multipurpose enzyme gave the significantly highest effect among the individual enzymes. Each of the cocktails was significantly better than their respective enzymes except with multipurpose enzyme. It was concluded that cocktail of enzymes is better than individual enzymes in their effects on metabolisable energy of rice husk.