Relações entre carboidratos e lipídios em dietas para tilápias do nilo em tanques-rede
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Data
2016-07-18
Autores
Coutinho, Juliano José de Oliveira [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O objetivo do estudo foi avaliar o desempenho produtivo de tilápias do Nilo criadas em gaiolas e alimentadas com dietas extrusadas com quatro níveis de carboidratos e lipídios em diferentes relações. Foram utilizados 1280 peixes machos revertidos sexualmente da linhagem gift (157,54 ± 3,50g), distribuídos em 16 gaiolas (1,0 m³), em delineamento inteiramente casualizado com quatro tratamentos e quatro repetições, com 80 tilápias do Nilo em cada gaiola. Os peixes foram alimentados com quatro dietas com aproximadamente 3500 kcal kg-1 de energia digestível, contendo quatro níveis de carboidratos e lipídios (CHO35/L9, CHO39/L8, CHO43/L7 e CHO47/L6%) e com diferentes relações de CHO:L (3,89; 4,87; 6,14; 7,83; respectivamente). As tilápias foram arraçoadas quatro vezes ao dia, durante 120 dias. Não houve mortalidade durante o período experimental. As tilápias alimentadas com as dietas contendo a relação CHO:L 6,14, obtiveram as melhores médias para o desempenho produtivo: ganho em peso médio (GPM) 397,24±5,06g; taxa de crescimento específico (TCE) 1,07±0,028%/dia e consumo médio de ração (CS) 462,08±5,06g e também para eficiência de retenção de energia bruta (EREB) 57,17±4,16% e para extrato etéreo no ganho em peso (EEGP) 13,71±1,47%, nas condições de realização do experimento. Na avaliação histológica houve um aumento na concentração de vacúolos de gordura nos tecidos hepáticos quando as relações de CHO:L aumentavam.
The aim of this was to evaluate the performance of Nile tilapia rared in cages fed extruded diets containing four relations of carbohydrates and lipids. 1280 male (157.54 ± 3,50g) were used and distributed in 16 cages (1.0 m³) in a completely randomized design with four treatments and four replicates. Each cage contains 80 Nile tilapia. The fish were fed diets with 3500 kcal kg -1 of digestible energy, containing four levels of carbohydrates and lipids (CHO35/L9, CHO39/L8, CHO43/L7 and CHO47/L6%) with the CHO:L relations: (3.89; 4.87; 6.14; 7.83; respectively). The tilapia were fed four times a day for 120 days. There was no mortality during the trial period. The tilapia fed diets containing the relation CHO:L 6.14, showed the best productive performance mean for weight gain (WG) 397.24 ± 5,06g; specific growth rate (SGR) 1.07 ± 0.028%/day, average feed intake (AFC) 462.08 ± 5,06g, also gross energy retention efficiency (GERE) 57.17 ± 4.16% and ether extract to weight gain (EEWG) 13.71 ± 1.47%, at the experiment conditions. Histological evaluation showed increased in fat vacuoles concentration and liver tissues when as CHO:L relations increased as well.
The aim of this was to evaluate the performance of Nile tilapia rared in cages fed extruded diets containing four relations of carbohydrates and lipids. 1280 male (157.54 ± 3,50g) were used and distributed in 16 cages (1.0 m³) in a completely randomized design with four treatments and four replicates. Each cage contains 80 Nile tilapia. The fish were fed diets with 3500 kcal kg -1 of digestible energy, containing four levels of carbohydrates and lipids (CHO35/L9, CHO39/L8, CHO43/L7 and CHO47/L6%) with the CHO:L relations: (3.89; 4.87; 6.14; 7.83; respectively). The tilapia were fed four times a day for 120 days. There was no mortality during the trial period. The tilapia fed diets containing the relation CHO:L 6.14, showed the best productive performance mean for weight gain (WG) 397.24 ± 5,06g; specific growth rate (SGR) 1.07 ± 0.028%/day, average feed intake (AFC) 462.08 ± 5,06g, also gross energy retention efficiency (GERE) 57.17 ± 4.16% and ether extract to weight gain (EEWG) 13.71 ± 1.47%, at the experiment conditions. Histological evaluation showed increased in fat vacuoles concentration and liver tissues when as CHO:L relations increased as well.
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Palavras-chave
Amido, Desempenho produtivo, Gordura, Oreochromis niloticus, Fat, Oreochromis niloticus, Productive performance, Starch