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BOZUTTI, S. R. A. Evaluation of alternative ingredients in diets of broilers with the addition of enzymes. 2009. 78p. M. Sc. Dissertation – Faculdade de Zootecnia e Engenharia de Alimentos, Universidade de São Paulo, Pirassununga, 2009. Two experiments were conduced to evaluate the inclusion of alternative ingredients, sunflower meal and sorghum, in diet of broilers with the addition of enzymes. The experiments were divided into three independent trials, which corresponded to each phase of raising: initial phase (1 – 21 days), where the performance characteristics were evaluated; growing phase (22 – 42 days), where the performance and the carcass characteristics were evaluated, and the final phase (43 – 49 days), where the performance and the carcass characteristics were also evaluated. For each trial 1,280 birds of both sexes were used to evaluate: performance (feed intake, wheight gain, feed conversion, carcass yield, and comercial cuts yield (breast, thigh, thigh + thigh of any fowl, wings and back)), litter humidity, digest viscosity. The data were submitted to variance analisys using the procedure of the program SAS (Statistc Analisys System, 2001) and the Tukey Test. In the first experiment, with sunflower meal, with 8 treatments,in factorial study, 2 x 2 x 2 ( 2 formulation – digestible and total aminoacids; 2 levels of sunflower meal inclusion – 0% and 15%; and enzyme use: with and without addition), with 4 repetitions of 40 poultries each. It was concluded that the use of 15% of the sunflower meal in the broiler ́s diet harmed the animals ́ performance, not affecting the carcass yield. In the growing and final phases, the best performance was found when the diets were made based on digestible aminoacids and with addition of enzymes; not influencing the humidity of the litter, increasing the digest viscosity. In the second experiment with sorghum 8 treatments were also used, in factorial study 2 x 2 x 2 (2 formulation – digestible and total aminoacids; 2 levels of substitution from the corn to the sorghum – 0 % and 100%; and enzyme use: with and without addition), with 4 repetitions of 40 poultries each. The sorghum has shown to be a great replacement of the corn in the diets, because it does not alter the poultry performance, bed humidity and digest viscosity. With both experiments performed, it was concluded that the alternative ingredients are feasible in the poultry feeding, not restricting their raising solely on corn and soybeans. . Key-words: bed humidity; digest viscosity; enzymes; performance; sunflower meal; sorghum.

Avaliação de ingredientes alternativos na alimentação de frangos de corte com a adição de enzimas