The objective of the experiment was verify the effect of the addition of exogen digestive enzymes in corn and soybean meal based diets on performance of broiler chickens. Were used 819 Hubbard chickens in completely randomized design, and 3 x 2 x 2 + 1 check factorial (enzyme, protein and energy levels and one treatment check) with 3 replications, of the 21 birds by replicate. Enzyme levels were 0.5, 1.0 and 1.5 g/kg of diet, energy levels were normal (3.000; 3.100 and 3.200 kcal/kg ME) and reduced (2.910; 3.007 and 3.040 kcal/kg ME) and the protein levels were normal (21.18, 19.95 and 19.43% CP) and reduced (20.54, 19.35 and 18.46% CP), respectively, for initial, growing and final phases, check diet had normal level of ME and CP, without enzyme. The body weight gain, ration intake, feed conversion and european factor production were evaluated. The results showed maintenance of the performance due to application of enzymes, that being verified by non significance (P> 0.05) of that factores at the 42 days and by improved feed conversion, reduction of the ration intake and higher european factor production at the 21 days of age. The study of the protein and enzyme levels interaction showed that 0.5 g/kg of enzyme the addition to the diet with reduced levels of the protein, there was higher weight gain of the birds. It was concluded that is viable the used addition exogen enzymes in ration of broiler chickens.
Enzymes; broiler; corn; soybean meal
