this study was carried out with the objective to evaluate the substitution of the corn for cassava meal in broilers diets in the growing and finishing phases. a completely randomized design, with six treatments representing cassava meal (0, 5, 10, 15, 20 and 25%) in replacing corn, six replicates and 25 broilers per replicate, was used. at the end of each phase, were analyzed feed intake (fi), weight gain (wg) and feed conversion (fc). the analysis of the data shown quadratic effect for growing and final phases. according to the statistical analysis the adequate cassava meal levels for each phase was determined. it was conclude that, in the growing phase, the broiler shown that up to 10.24% of corn should be replace by cassava meal , without affect the broilers performance, therefore for the final phase, any substitution level of cassava meal should be recommended due to reduction on the performance with the use of this manioc by-product.