The aim of this study was to evaluate the growth performance of broiler chickens fed diets with inclusion of probiotics and multienzyme complex and its inclusion with a 3% reduction in the levels of energy and protein. 630 broilers were used, since 14 up to 42 days old, submitted to three experimental diets: diet as nutritional requirements (control); diet as required with inclusion of multienzyme complex and probiotics (100g / ton), and diet with 3% reduction in levels of metabolizable energy and crude protein requirements with inclusion of the additive (100 g/ton). Was observed increase (P <0.05) of feed intake in diets with 3% reduction in the levels of protein and energy during periods of 14-21, 35-42 and 14-42 days, while the diet with added complex led to similar consumption (P> 0.05) to the control in all periods analyzed. Diets with reduced energy and protein differed from control (P <0.05) in feed conversion ratio and live weight only at 21 days age. There were no differences (P> 0.05) in gain of weight and bio-economic index. During the growing and finishing phases, the inclusion of the multienzyme complex and probiotics in diets for broilers formulated as nutritional requirement does not improve animal performance. With 3% reduction in the levels of protein and energy rations in relation to the requirements and inclusion of multienzyme complex and probiotics consumption increases, however, the body weight, feed conversion, weight gain and bio-economic index do not change.
additives; enzymes; performance; poultry