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Ars vet ; 24(3): 193-199, 2008.
Article in Portuguese | VETINDEX | ID: vti-31879

ABSTRACT

  The aim of this study was to evaluate the digestible tryptophan level(dig. Trp) for laying Japanese quail diets. Four hundred Japanese quail aging 21 to 30 weeks were housed in laying cages, with initial average weight of 158.50 g and egg production of 84.50%. The experimental arrangement consisted on a randomized design, containing eight blocks, five of tryptophan levels (0.12, 0.16, 0.20, 0.24 and 0.28% dig. Trp), eight replicates of ten birds and three experimental periods of 21 days. The evaluated parameters were feed intake (g/bird/day), egg production (%/bird/day), average weight of eggs (g), weights of yolk (g), albumen (g), shell (g), percentage of shell (%), specific gravity (g/cm3) and Haugh units. The tryptophan level affected (P<0.05) all parameters, except feed intake, average eggs weight and weight of yolk. The performance of quails using the statistical adjustment through quadratic regression, broken-line regression model, suggested that the minimum requirement of diets of digestible tryptophan is 0.21% of the diet, allowed the daily intake of 45.0 mg of tryptophan per bird, and the corresponding ratio between digestible tryptophan and digestible lysine was 21%. KEY-WORDS: Amino acids. Coturnix coturnix japônica. Exigency Quality of eggs.    


O objetivo deste trabalho foi avaliar os níveis de triptofano digestível (Trp dig.) em dietas para codornas japonesas em fase de postura. Foram utilizadas 400 codornas japonesas de 21 a 30 semanas de idade, alojadas em gaiolas de postura, com peso inicial de 158,50 gramas e produção média de ovos de 84,50%. O delineamento experimental foi em blocos casualizados, constituído por oito blocos, cinco tratamentos(0,12; 0,16; 0,20; 0,24 e 0,28% Trp dig.), oito repetições de dez aves/repetição e três períodos experimentais de 21 dias cada. As variáveis avaliadas foram consumo de ração (g/ave/dia), produção de ovos (%/ave/dia), peso médio dos ovos (g), pesos de gema (g), albúmen (g), casca (g), porcentagem de casca (%), gravidade específica (g/cm3) e unidades Haugh. Todas as variáveis apresentaram efeitos (P

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