Digestible isoleucine requirements for 22- and 42-day-old broilers

• Autor(a) principal: Duarte, Karina Ferreira
• Data de Publicação: 2015
• Outros Autores: Junqueira, Otto Mack, Filardi, Rosemeire da Silva, Laurentiz, Antonio Carlos de, Domingues, Carla Heloisa de Faria, Rodrigues, Eliana Aparecida
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Acta Scientiarum. Animal Sciences (Online)
• Texto Completo: https://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/24473
• topic: digestible amino acids; ideal protein; performance; regression analyses

Current experiment established different criteria to evaluate the requirements of digestible isoleucine for 22- and 42-day-old broilers by different regression models (quadratic, exponential and Linear Response Plateau) and, in the case of statistical significance, the comparison of means by Duncan’s test at 5% probability. A total of 1,920 Cobb 500 male broilers were used in an entirely randomized experimental design, with 6 treatments (6 digestible isoleucine levels: 0.6118; 0.6655; 0.7192; 0.7729; 0.8265 and 0.8802%) and 8 replications, with 40 broilers each. Data on performance and carcass characteristics were evaluated. Level 0.7192% of digestible isoleucine was considered standard. The digestible isoleucine level recommended for 22- and 42-day-old broilers is 0.7729%, corresponding to a digestible isoleucine:lysine ratio of 72%.