Digestible tryptophan requirements for broilers from 22 to 42 days old

Revista Brasileira de Zootecnia

Karina Ferreira Duarte²  Otto Mack Junqueira¹  Rosemeire Da Silva Filardi¹  Jefferson Costa De Siqueira¹  Maíra Mangili Puzotti¹  Edivaldo Antônio Garcia¹  Andrea De Britto Molino¹  Antonio Carlos De Laurentiz¹ 

[1] ,Universidade Estadual Paulista Júlio de Mesquita Filho Faculdade de Ciências Agrárias e Veterinárias Jaboticabal SP ,Brasil

关键词: digestible amino acids;    ideal protein;    performance;    regression analysis;   

DOI  :  10.1590/S1516-35982013001000006

来源: SciELO

【 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】

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