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O trabalho foi conduzido no Setor de Avicultura do Departamento de Zootecnia da Universidade Federal de Santa Maria com o objetivo de verificar as respostas de desempenho de frangos de corte, criados com sexos separados, alimentados pelo conceito tradicional (Proteína Bruta - PB) em comparação a dietas formuladas pelo critério de Proteína Ideal (PI), num período de 1 a 42 dias de idade. A análise econômica comparativa entre os dois métodos de alimentação também foi realizada. Foram utilizados 960 pintos de corte de um dia de idade (480 machos, 480 fêmeas) da linhagem ROSS. As dietas experimentais baseadas no conceito de PB foram formuladas segundo as recomendações do NRC (1994) e as dietas formuladas pelo conceito de PI foram adaptadas de HAN & BAKER (1994). O delineamento experimental foi o inteiramente casualizado, constituindo 4 tratamentos com 12 repetições de 20 aves cada. Foram estudados os parâmetros: consumo alimentar, ganho de peso e peso corporal, ganho médio diário, conversão alimentar e índice de eficiência nutricional. Os resultados obtidos indicaram que os parâmetros estudados foram mais influenciados na fase inicial. As dietas formuladas pelo conceito de PI, baseada no conteúdo de aminoácidos digestíveis (AAD), influenciaram positivamente os parâmetros estudados, proporcionando significativos melhores ganhos de peso e eficiência alimentar, tanto para os machos quanto para as fêmeas nas fases inicial e total, sendo similares nas demais fases. As aves alimentadas com AAD apresentaram uma maior lucratividade nas fases inicial e crescimento. Esses dados permitem concluir que dietas à base de milho e farelo de soja, formuladas para atender às exigências de AAD, proporcionam melhores desempenhos biológico e econômico, em relação àquelas formuladas à base de PB, do primeiro até os 35 dias de idade. A fase final mostrou o contrário, sendo o conceito de PB mais econômico do que a Pl. The study was carried out at the Poultry Section of the Departament of Animal Science at Federal University of Santa Maria, in order to evaluate the performance of broilers grown sexed and fed with diets formulated by the traditional concept (Crude Protein - CP), which is based on total amimo acids (TAA) and fed with the approach of Ideal Protein (IP), which is based on digestible amino acids (DAA), in the period from 1 to 42 days of age. A comparative economic analysis among the two feeding methods was also accomplished. There were 960 chicks (Ross) at the age of 1 day, being 480 males and 480 females. The diet based on the concept of CP was formulated according to the recommendation of NRC (1994) and the diet formulated by the concept of IP was adapted from Han and Baker (1994). The completely randomized experimental design consisted of 4 treatments with 12 replications of 20 chicks each. The feed intake, phase gain, body weight, daily gain, feed conversion and the nutritional efficieny index were evaluated. The results indicated that the parameters studied were more efficient in the initial phase. The diet formulated by the Ideal Protein concept, based on the content of DAA, influenced all parameters studied positively, providing significantly better gain weight and feed efficiency in both male and female chicks in the initial and final phases, being similar in the growing phase. The chicks fed with DAA showed greater profits in the initial phase and during the growth phase. These data allowed the conclusion that diets containing corn and soybean meal as base for the formulated feed provides better biological and economic performance of the broilers when compared to those formulated with crude Protein, from day the first up to 35 days of age. The final phase (35-42) showed the contrary, being the CP concept more economical than IP

DESEMPENHO DE FRANGOS DE CORTE, SEXADOS, SUBMETIDOS A DIETAS FORMULADAS PELOS CONCEITOS DE PROTEÍNA BRUTA versus PROTEÍNA IDEAL