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

Author(s)

Karina Ferreira Duarte ^[1] ; Otto Mack Junqueira ; Rosemeire da Silva Filardi ^[3] ; Antonio Carlos de Laurentiz ^[4] ; Carla Heloísa de Faria Domingues ^[5] ; Eliana Aparecida Rodrigues ^[6]

Affiliation

^[1] Universidade Estadual Paulista "Júlio de Mesquita Filho". Faculdade de Ciências Agrárias e Veterinárias - Brasil

^[3] Universidade Estadual Paulista "Júlio de Mesquita Filho". Faculdade de Engenharia - Brasil

^[4] Universidade Estadual Paulista "Júlio de Mesquita Filho". Faculdade de Engenharia - Brasil

^[5] Universidade Estadual Paulista "Júlio de Mesquita Filho". Faculdade de Ciências Agrárias e Veterinárias - Brasil

^[6] Instituto Federal de Educação, Ciência e Tecnologia do Triangulo Mineiro - Brasil

• Document type: Journal article
• Source: Acta Sci., Anim. Sci.; v. 37, n. 1, p. 23-28, 2015-03-00.

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%. (AU)