Adição de lisina digestível em rações experimentais para juvenis de tilápia-do-nilo

Rampe, Maria Cecília Cabral; Pacheco, Mozart; Júnior, J.G. Vargas; Giannotti, Juliana Di Giorgio; Demuner, Leandro Félix; Marin, Julio Francisco Valiati

doi:10.1590/1678-5729

Cited by 5 publications

(1 citation statement)

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“…The higher protein efficiency achieved with the reduction of CP occurred because the control diet (32% CP) consisted of amino acids at levels exceeding what is required by the fish, in comparison to the diets with reduced CP and amino acid supplementation (BOMFIM et al, 2008). These results show that fish, consistent with that observed in birds and swine, do not have protein requirements, but need an adequate balance of amino acids in order to meet maintenance and production needs (OLIVEIRA et al, 2014;RAMPE et al, 2014).…”

Section: Resultssupporting

confidence: 60%

Crude protein reduction with amino acid supplementation in tambaqui fingerling diets

Lima

Bomfim

Siqueira

et al. 2015

SCA

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The aim of this study was to evaluate the effect that reduced crude protein (CP) diets with amino acid supplementation, based on the ideal protein concept, have on the performance of tambaqui fingerlings. In total, 750 fingerlings with an initial weight of 0.44 ± 0.14 g, were used in a completely randomized design, with six treatments, five replications, and 25 fish per experimental unit. Treatments consisted of six isocaloric, isocalcic, isophosphoric, and isolysinic diets containing 32.0, 30.5, 29.0, 27.5, 26.0, and 24.5% CP. Performance parameters, carcass yield, body composition (body humidity, protein, and fat content), and nitrogen retention efficiency (NRE) of the fish were evaluated. When the CP content was reduced to 27.5%, there was an improvement in weight gain, specific growth rate, feed conversion, and protein efficiency rate. Feed intake was higher in fish fed diets containing 26% CP, followed by those fed diets containing 29 and 27.5% CP; diets containing other levels of CP did not differ among themselves. CP intake was reduced by the use of diets containing 24% CP, and the carcass yield was not influenced by the treatments. Reduced CP had no influence on body composition. NRE was higher in response to diets containing 26.0 and 24.5% CP. Reducing dietary CP content, from 32.0 to 24.5%, based on the ideal protein concept, is possible for tambaqui fingerlings, and a decrease of up to 24.5% enhances the fish performance. Key words: Amino acids, Colossoma macropomum, performance, protein nutrition ResumoAvaliou-se os efeitos da redução da proteína bruta (PB) com suplementação de aminoácidos, com base no conceito de proteína ideal, em rações no desempenho de alevinos de tambaqui. Utilizou-se 750 alevinos com peso inicial de 0,44 ± 0,14 g, em delineamento inteiramente casualizado, com 6 tratamentos, 5 repetições e 25 peixes por unidade experimental. Os tratamentos consistiram em 6 rações isoenergéticas, isocálcicas, isofosfóricas e isolisínicas com 32,0; 30,5; 29,0; 27,5; 26,0; 24,5% de PB. Avaliaram-se as variáveis de desempenho, composição corporal (umidade, proteína e gordura corporais) e eficiência de retenção de nitrogênio (ERN). Com a redução da PB a partir de 27,5%, observou-se melhora no ganho de peso, na taxa de crescimento específico, na conversão alimentar e na taxa de eficiência proteica. O consumo de ração foi superior nos peixes alimentados com dietas contendo 26% de PB, seguidos de 29,0 e 27,5% de PB, os demais níveis não variaram entre si. O consumo de proteina bruta reduziu com a utilização da dieta com 24% de PB e o rendimento de carcaça não foi influenciado pelos tratamentos. A redução da PB não influenciou a composição corporal dos peixes. A ERN foi superior nos níveis de 26,0 a 24,5% de PB. É possível reduzir de 32,0 para 24,5% o teor de PB em rações, com base no conceito de proteina ideal, para alevinos de tambaqui, e a redução do teor de PB até o nível de 24,5% potencializa o desempenho dos peixes.

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Section: Resultssupporting

confidence: 60%