Dietary lysine requirement of juvenile cobia (Rachycentron canadum)

Qicun, Zhou; Wu, Zhaofei; Chi, Shuyan; Yang, Qihui

doi:10.1016/j.aquaculture.2007.08.056

Cited by 125 publications

(121 citation statements)

References 30 publications

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“…O adequado nível de proteína e o balanceamento de aminoácidos influenciaram a deposição de proteína nos filés, mas não acarretou redução nos níveis de gordura, principalmente pela suplementação de lisina, como observado por Zhou et al (2007) Com a redução dos níveis de proteína na dieta, foi observada redução linear nos coeficientes de digestibilidade aparente da energia bruta, proteína bruta, extrato etéreo e fósforo das dietas (Tabela 4).…”

Section: Resultsunclassified

Redução da proteína em dietas para tilápias-do-nilo por meio da suplementação de aminoácidos com base no conceito de proteína ideal

Righetti¹,

Furuya

Conejero³

et al. 2011

R. Bras. Zootec.

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RESUMO -Este trabalho foi realizado para avaliar os efeitos da redução da proteína da dieta, por meio da suplementação com aminoácidos sintéticos, sobre o desempenho produtivo, a digestibilidade e o diâmetro da fibra muscular de tilápias-do-nilo. Os aminoácidos (lisina, metionina, treonina e arginina) foram suplementados de forma a manter o perfil de aminoácidos da dieta-referência. Foram utilizados 160 peixes com peso vivo médio inicial de 105,7 ± 2,5 g, distribuídos em 16 tanques (1 m 3 cada) e alimentados com dietas contendo 26,74; 25,82; 23,09 ou 22,16% de proteína digestível durante 110 dias. Não foi observado efeito dos níveis de proteína nas dietas sobre o ganho de peso diário, o índice hepatossomático, a gordura visceral, o rendimento de filé, os teores corporais de umidade, proteína bruta e cinzas, o teor de cinzas no filé, a taxa de sobrevivência e o diâmetro das fibras do músculo dorsal. Com a redução dos níveis de proteína na dieta, foi observada redução linear dos coeficientes de digestibilidade aparente da energia bruta, proteína bruta, extrato etéreo e fósforo das dietas. Houve efeito quadrático dos níveis de proteína sobre a conversão alimentar, a taxa de eficiência proteica, a retenção de nitrogênio, o nitrogênio excretado, a umidade no filé, a gordura corporal e no filé e proteína no filé, de modo que os melhores valores foram estimados com 24,53; 24,25; 24,04; 25,15; 24,67; 24,14; 24,34; 25,11% de proteína digestível, respectivamente. É possível reduzir, de 26,74 para 24,53%, a proteína digestível em dietas para tilápias-do-nilo na fase de 100 a 500 g. Palavras-chave: aminoácido, desempenho, digestibilidade, fibra muscular, peixe Protein reduction in diets for Nile tilapia by amino acids supplementation based on the ideal protein concept ABSTRACT -The objective of this work was to evaluate the effects of reduction of protein in diets for Nile tilapia by supplementation of synthetic amino acids on performance, digestibility and diameter of muscle fiber of Nile tilapias.The amino acids (lysine, methionine, threonine and arginine) were supplemented to keep the profile of amino acids in the reference diet. It was used 160 fish with initial live weight of 105.7 ± 2.5 g, distributed in 16 tanks (1 m 3 each tank) fed diets containing 26.74; 25.82; 23.09 or 22.16% of digestible protein for 110 days. It was not observed any effects of protein levels in the diets on daily weight gain, hepatosomatic index, visceral fat, fillet yield, carcass humidity, crude protein and ash, fillet ash, survival rate and on the white muscle fiber diameter. A linear decrease on apparent digestibility coefficients, gross energy, crude protein, ether extract and phosphorus was observed when protein levels in the diet were reduced. There was a quadratic effect on feed conversion ratio, protein efficiency rate, nitrogen retention, nitrogen excretion, fillet humidity, carcass and fillet fat and fillet protein, in which the best-fit responses were estimated with 24.53, 24.25, 24.04, 25.15, 24.67, 24.14, 24.34 IntroduçãoA...

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Section: Resultsunclassified

Redução da proteína em dietas para tilápias-do-nilo por meio da suplementação de aminoácidos com base no conceito de proteína ideal

Righetti¹,

Furuya

Conejero³

et al. 2011

R. Bras. Zootec.

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“…The experimental diets were formulated to contain almost the same nutrient content which was around 45% crude protein and 12% crude lipid based on previous studies (Chou et al 2001;Lunger et al 2006Lunger et al , 2007Zhou et al 2007;Wang et al 2005). The amino acid composition of the PBM used in the present study conformed to the published values for this ingredient (Shapawi et al 2007;Yu 2006).…”

Section: Discussionmentioning

confidence: 95%

Replacement of fishmeal in cobia (Rachycentron canadum) diets using poultry by-product meal

Saadiah¹,

Abol-Munafi²,

Utama³

2010

Aquacult Int

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An 8-week feeding trial was conducted to evaluate the use of local poultry by-product meal (PBM) in replacement of imported fishmeal in the diets of cobia, Rachycentron canadum. Six isolipidic (12%) and isoproteic (45%) experimental diets were formulated using PBM to replace fishmeal at 20, 40, 60, 80 and 100% dietary protein.Eleven juvenile cobia (initial mean weight of 30.7 ± 0.78 g) were randomly stocked in 300-L circular fibreglass tanks and hand-fed based on the total biomass of each tank, twice a day at 0900 h and 1500 h. The fish were group weighed at 2-week intervals to monitor their growth performance in order to adjust the feeding ratio. At the end of the feeding trial, weight gains (WGs) ranging from 221 to 322% were obtained. The specific growth rate (SGR), WG and protein efficiency ratio (PER) for fish fed with PBM-based diets were not significantly different (P [ 0.05) when compared to fish fed the control diet. The best SGR was recorded for fish fed with 60PBM diet, which was significantly higher (P \ 0.05) than those fed the control diet with values at 2.40 ± 0.01 and 1.97 ± 0.26%/day, respectively. The FCR of 1.83 ± 0.05 for fish fed the 60PBM diet was not significantly different (P [ 0.05) when compared to those fed the control diet. The PBM source and dietary level did not significantly (P [ 0.05) affect the hepatosomatic index of the fish. The results from this study suggested that PBM could replace 100% dietary fishmeal without adversely affecting the growth performance, but an optimal replacement level at approximately 60% was recommended for better growth performance and efficient feed utilization.

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“…These values for methionine and lysine are in accordance with those of commonly cultured fi sh, 1.8 -3.2% and 3.2 -6.2% dietary protein respectively (Wilson 2002 ;Zhou et al . 2006Zhou et al . , 2007.…”

Section: Protein and A Mino A Cidsmentioning

confidence: 96%