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Dois experimentos foram conduzidos com o objetivo de avaliar o desempenho e analisar a viabilidade econômica comparativa entre dois conceitos protéicos e duas linhagens de frangos de corte (Hybro G e Hybro PG), criados no período de inverno, com temperatura média de 16°C e UR média de 72%. As aves foram alimentadas com dietas formuladas pelo conceito de Proteína Bruta (PB) sem suplementação de aminoácidos e Proteína Ideal (PI), de 1 a 42 dias de idade nos dois sexos. O delineamento utilizado nos dois experimentos foi inteiramente casualizado num esquema fatorial 2 x 2 (2 conceitos protéicos e 2 linhagens) com 6 repetições de 20 aves para cada sexo. Machos não mostraram interação entre proteína x linhagens para as variáveis estudadas; entretanto, machos do conceito PB consumiram mais ração, porém ganharam menos peso e converteram pior que os PI. Para fêmeas, houve interação para a variável conversão alimentar, sendo que as aves do conceito PI da linhagem PG, foram mais eficientes que as aves do conceito PB. Para a mesma categoria, na análise dos efeitos isolados, não houve diferença significativa para consumo, entretanto, as fêmeas PI ganharam mais peso que as fêmeas PB. Na análise econômica dos resultados, foi observado que a formulação de dietas PI para ambos os sexos é mais rentável. Two experiments were conducted to evaluate the performance of broilers and analyze the comparative economical effects of two concepts of protein given to two lines of broilers (Hybro G and Hybro PG) reared during cold weather, average of 16 C and RH of 72%. The broilers were fed to diets formulated based on the concept of crude protein (PB) with addition of aminoacids or on the ideal protein (PI), from 1 to 42 days of age for both sexes. The experimental design in both experiments was entirely randomized in a factorial 2 x 2 (2 protein concept vs 2 lines). The males did not show evidence and the interaction between protein vs lines for all variables studied, however, males receiving crude protein had higher fed consumption, but, had a lower weight gain and worse fed conversion compared to ideal protein, For females there was an interaction for fed conversion, where broilers of the line PG receiving PI were more efficient than those of the concept PB. For the same category, analyzing the isolated effects, there was no significant difference for feed consumption, but females of PI were heavier than those of PB. The economical analysis of the results showed that the formulation of the PI concept for both sexes is worth

Aplicação dos conceitos de proteína bruta e proteína ideal sobre o desempenho de frangos de corte machos e fêmeas criados no inverno