Two assays were carried out to evaluate the broilers performance, nutrients digestibility and the energy values of diets formulated with corn from different varieties (Experiment 1) and regions (Experiment 2), supplemented with an enzymatic complex. In each assay, were used 480 male broilers Hubbard, 14 days old, grown from 14 to 27 days to evaluate performance. The broiler chickens fed an experimental diets in 6x2 factorial design (varieties x region), in four replicates of 10 broilers in each experimental unit. Each corn were mixed in a basal diet in a fixed amount of 63.24%, constituting the experimental diets. The crude protein and energy values changed according to corn composition. Chromic oxide (0.5%) was used as indicator. During the 23rd to 27th days, the excretas were collected and, in the 28th day, all broilers of each replicate were slaughtered and the digesta present in the last 30 cm of the terminal ileum, anterior to ileo-cecal junction, was collected. The samples of the excreta and ileal digesta were analyzed for dry matter, nitrogen, gross energy and starch, and the digestibility coefficients and energy values, were calculated using the indigestibility factor of chromic oxide. It was concluded that origen (varieties or regions) effected broiler performance; the nutrient digestibility and energy values of diets formulated with the corn type showed difference as a function of the chemical composition. The ileal digestibility of crude protein, starch and energy was improved in the diets supplemented with enzymes.
broilers performance; corn; digestibility; metabolizable energy; enzymes
