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Digestible tryptophan requirements for broilers from 22 to 42 days old

2013; Sociedade Brasileira de Zootecnia; Volume: 42; Issue: 10 Linguagem: Inglês

10.1590/s1516-35982013001000006

1806-9290

Karina Ferreira Duarte, Otto Mack Junqueira, Rosemeire da Silva Filardi, Jefferson Costa de Siqueira, Maíra Mangili Puzotti, Edivaldo Antônio Garcia, Andréa de Britto Molino, Antônio Carlos de Laurentiz,

Rabbits: Nutrition, Reproduction, Health

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.