Níveis de triptofano digestível nas fases pré-inicial e inicial em frangos machos e fêmeas

• Ano de defesa: 2014
• Autor(a) principal: Borges, Bruno Samuel
• Orientador(a): Nunes, Romão da Cunha
• Banca de defesa: Nunes, Romão da Cunha, Rocha, Fernanda Rodrigues Taveira, Stringhini, José Henrique
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Ciência Animal (EVZ)
• Departamento: Escola de Veterinária e Zootecnia - EVZ (RG)
• País: Brasil
• Palavras-chave em Português: Aminoácido digestível; Aves; Desempenho; Digestibilidade
• Palavras-chave em Inglês: Chickens; Digestible amino acid; digestibility; Performance
• Área do conhecimento CNPq: PRODUCAO ANIMAL::MANEJO DE ANIMAIS
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/4016

We aimed to evaluate digestible tryptophan level in males and females broilers on pre-initial (one to seven days old) and initial phase (eight to 21 days old) diets. Four experiments were conducted, one with males on pre-initial phase, one with males on initial phase, another with females on pre-initial and one with females on initial phase. The design was completely randomized with four treatments, five replicates with ten animals each, where each repetition consists an experimental unit. In the experiment, tryptophan requirement was determined using diets with different digestible tryptophan levels. A deficient tryptophan diet was formulated, considered the basal diet, which was supplemented with L -tryptophan replacing inert material in order to achieve digestible tryptophan desirable levels. The treatments of experiment 1 consisted of: T1 - 0.209% digestible tryptophan diet (basal diet); T2 - 0.223% digestible tryptophan diet; T3 - 0.235% digestible tryptophan diet; T4 - 0.248% digestible tryptophan diet for male broilers in preinitial phase; Treatments for experiment 2 were: T1 - 0.187% digestible tryptophan diet (basal diet); T2 - 0.200% digestible tryptophan diet; T3 - 0.211% digestible tryptophan diet; T4 - 0.223% digestible tryptophan diet for male broilers on initial phase; Treatments for experiment 3 are: T1 - 0.212% digestible tryptophan diet (basal diet); T2 - 0.225% digestible tryptophan diet; T3 - 0.238% digestible tryptophan diet; T4 - 0.252% digestible tryptophan diet for female chickens cut i n pre-starter; Treatments for experiment 4 are: T1 - diets with 0.186% digestible tryptophan (basal diet); T2 - diet with 0.198% digestible tryptophan; T3 - diet with 0.209% digestible tryptophan; T4 - diet with 0.221% digestible tryptophan for female broiler chickens on initial phase. Diets were formulated with corn, soybean meal, poultry gut meal and bone meal, supplemented with industrial amino acid LLysine, DL-methionine, L-threonine, L-arginine, L-valine, and L-tryptophan. Feed intake, weight gain, feed conversion, as well as nutrients digestibility evaluation was performed. Performance and diet nutrients metabolism data were subjected to variance analysis (ANOVA). Digestible tryptophan levels estimates were made by linear models and quadratic regression at 5% probability. SAS 9.2 was used. After analyzing obtained data, it was found that; amino acid supplementation did not affect broilers of neither sex performance. Digestible tryptophan levels for male broilers on pre-initial phase of 0.209% and on initial phase of 0.187%, and digestible tryptophan levels for female broilers in pre-initial of 0,212% and on initial phase of 0,186% is recommended.