an investigation of the effects of using an enzyme-probiotic combination on broilers performance

background: growth promoters are chemical and biologicalsubstances that are added to livestock food with the aimto improve the growth of chickens in fattening and the utilizationof food, and in this way achieve better production and financialresults. objectives:an experiment was conducted to evaluatethe effects of enzyme complex, probiotic, and their combinationon performance of broilers fed a basal wheat-barley-soybeanmeal diet from 1 to 47 d of age. methods:atotal of 480-dayoldmale broiler chicks (arbor acres) were randomly assigned to6 treatments, with 4 replicate cages per treatment and 20 birds percage. the experiment consisted of a 3×2 factorial arrangementof the treatments, with 3 concentrations of enzyme complex (0,half of the commercial suggested level or commercial suggestedlevel) and 2 concentrations of probiotic (0 and suggested level).results: results showed that the suggested level of enzymecomplex could improve body weight and feed conversion ratio(p