Digestible tryptophan requirements for broilers from 22 to 42 days old

Revista Brasileira de Zootecnia

Molino, Andrea de Britto⁵  Siqueira, Jefferson Costa de⁶  Laurentiz, Antonio Carlos de¹  Puzotti, Maíra Mangili⁴  Garcia, Edivaldo Antônio⁵  Junqueira, Otto Mack²  Filardi, Rosemeire da Silva²  Duarte, Karina Ferreira³ 

[1] Universidade Federal de Goiás, Jataí, Brasil;Universidade Estadual Paulista Júlio de Mesquita Filho, Ilha Solteira, Brasil;Universidade Estadual Paulista Júlio de Mesquita Filho, Jaboticabal, Brasil;Universidade Estadual de Maringá, Maringá, Brasil;Universidade Estadual Paulista Júlio de Mesquita Filho, Botucatu, Brasil;Universidade Federal do Maranhão, Chapadinha, Brasil

关键词: digestible amino acids;    ideal protein;    performance;    regression analysis    Introduction Among other essential amino acids;    tryptophan stands out for participating in protein synthesis and being a precursor of serotonin;    which is related to the stimulation of feed intake (Henry et al;   

DOI  :  10.1590/S1516-35982013001000006

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objective of this experiment was to establish different criteria to evaluate the requirements of digestible tryptophan for broilers from 22 to 42 d of age, using different regression models (quadratic, exponential and Linear Response Plateau) and in case of statistical significance the comparison of means by Duncan test at 5% probability was also adopted. A total of 1,920 Cobb 500 male broilers were distributed in a completely randomized experimental design, with 6 treatments (6 digestible tryptophan levels: 0.1395, 0.1610, 0.1825, 0.2040, 0.2255 and 0.2470%) and 8 replications containing 40 broilers each. Performance and carcass characteristics were evaluated. The level of 0.2255% of digestible tryptophan numerically improves feed conversion, and the 0.1919% estimated by the quadratic equation significantly improves carcass yield.

【 授权许可】

CC BY-NC