<b>Digestible isoleucine requirements for 22- and 42-day-old broilers

Karina Ferreira Duarte; Otto Mack Junqueira; Rosemeire da Silva Filardi; Antonio Carlos de Laurentiz; Carla Heloisa de Faria Domingues; Eliana Aparecida Rodrigues

doi:10.4025/actascianimsci.v37i1.24473

Karina Ferreira Duarte Universidade Estadual Paulista "Júlio de Mesquita Filho"
Otto Mack Junqueira Universidade Federal de Goiás / Universidade Estadual Paulista "Júlio de Mesquita Filho"
Rosemeire da Silva Filardi Universidade Estadual Paulista “Júlio de Mesquita Filho”
Antonio Carlos de Laurentiz Universidade Estadual Paulista “Júlio de Mesquita Filho”
Carla Heloisa de Faria Domingues Universidade Estadual Paulista "Júlio de Mesquita Filho"
Eliana Aparecida Rodrigues Instituto Federal de Educação, Ciência e Tecnologia do Triangulo Mineiro

DOI: https://doi.org/10.4025/actascianimsci.v37i1.24473

Keywords: digestible amino acids, ideal protein, performance, regression analyses

Abstract

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%.

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