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a40v34n6 - Cincia Rural Santa Maria v.34 n.6 p.1927-1931...

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1927 Ciência Rural, v.34, n.6, nov-dez, 2004. Ciência Rural, Santa Maria, v.34, n.6, p.1927-1931, nov-dez, 2004 ISSN 0103-8478 Aplicação dos conceitos de proteína bruta e proteína ideal sobre o desempenho de frangos de corte machos e fêmeas criados no inverno 1 Geni Salete de Toledo 2 Jorge López 3 Paulo Tabajara Costa 4 Harvey de Souza 5 Performance of males and females broilers fed diets based on crude or ideal protein during the winter 1 Parte da tese de doutorado do primeiro autor. 2 Médico Veterinário, Doutor, Professor Adjunto, Departamento de Zootecnia, Universidade Federal de Santa Maria (UFSM), RS. Autor para correspondência. E-mail: [email protected] 3 Engenheiro Agrônomo, PhD, Professor Titular, Departamento de Zootecnia, Universidade Federal do Rio Grande do Sul. 4 Médico Veterinário, PhD, Professor Titular, Departamento de Zootecnia, UFSM. 5 Acadêmico do Curso de Medicina Veterinária, UFSM. RESUMO 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. Palavras-chave : frango de corte, linhagens, proteína bruta, proteína ideal. ABSTRACT 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
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