Níveis de triptofano em dietas para codorna japonesa em postura

• Ano de defesa: 2006
• Autor(a) principal: Pinheiro, Sandra Regina Freitas
• Orientador(a): Barreto, Sérgio Luiz de Toledo
• Banca de defesa: Albino, Luiz Fernando Teixeira , Rostagno, Horácio Santiago , Pinto, Rogerio , Carvalho, Debora Cristine de Oliveira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Zootecnia
• Departamento: Genética e Melhoramento de Animais Domésticos; Nutrição e Alimentação Animal; Pastagens e Forragicul
• País: BR
• Palavras-chave em Português: Codorna; Alimentação e rações; Triptofano; Exigência nutricional
• Palavras-chave em Inglês: Quail; Feeding and feeds; Tryptophan; Nutritional requirement
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/5639

An experiment was carried out in the Animal Science Department at the Universidade Federal de Viçosa. The objective was to determine the nutritional requirement of tryptophan for Japanese quail from 21 to 30 weeks of age. Four hundred Japanese quail, with initial weight of 158,49 grams and egg production average of 84,50%. The experimental design was completely randomized blocks, with eight blocks, in a factorial system of 5x3, with five levels of tryptophan and three experimental periods of 21 days each, all treatments were composed by eight repetitions of ten birds per repetition. The treatments consisted in five diets with 20% of crude protein, supplemented with five levels of L-tryptophan (0,000; 0,040; 0,080; 0,120 and 0,160%), providing a total of 0,120; 0,160; 0,200; 0,240 and 0,280% of digestible tryptophan, respectively. The birds were homogeneous according to the egg production rate and distributed in the cages, totally ten birds per cages. The studied variables were: feed intake (g/bird/day), tryptophan intake (mg/bird/day), egg production (%), production of marketable eggs (%/bird/day), egg medium weight (g), egg mass (kg/bird/day), feed conversion (kg intake feed per dozen eggs and kg eggs), weight of yolk (g), weight of albumen (g), weight of shell (g), percentage of yolk (%), percentage of albumen (%), percentage of shell (%), egg width (mm), egg length (mm), specific gravity (g/cm3) and units Haugh. Only the tryptophan intake, egg production rate, albumen weight, shell weight, percentage of shell, specific gravity and unit Haugh show significant effects (P<0,05) by tryptophan levels in the experimental diets. The performance of the quails in posture, respecting the statistical adjustment obtained through models of linear and quadratic regression and broken-line regression model, and the biological interpretation, allow us to conclude that to obtain the best productive performance, the quails diets should contain the level of 0,21% digestible tryptophan, what results in the daily intake of 45,0 mg per bird of tryptophan, corresponding to the relation of digestible tryptophan: digestible lysine ratio of 21%.