Two experiments were conducted to evaluate theeffects of microbial enzymes on weight gain, feed intake and feed: gain ratio.In the first trial, 288 chicks from 8-21 days old were assigned to a completerandomized design with a 2 x 2 fatorial arrangement: meal (soybean meal + sorghumand soybean meal + millet) and with or without multi-enzymatic complex (MC),with four replications of 18 bird per experimental unit. Diets were formulatedto contain the same levels of metabolizable energy (ME), amino acids, calciumand phosphorus. In the second trial, 384 broilers from 21-42 days old were assignedto a complete randomized design with six treatments and four replications pf16 birds per experimental unit. All diets contained corn, soybean meal, 7 and9% of ME, levels of 7 and 5% of methionine (Met), Met + cystine (Cys) and lysine(Lys) with or without MC. It was concluded, in the first trial, that the inclusionof MC in both soybean meal and sorghum and millet-based diets did not show positiveeffect on broiler performance. In the second trial, ME and amino acids (Met,Met+Cys and Lys) values could be overestimated in 9 and 7%, respectively, whendietary MC level increased, with no effect on bird performance.
