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Levels of vitamin C and iron for Nile tilapia Oreochromis niloticus Niveis de vitamina C e ferro para tilapia do Nilo Oreochromis niloticus



Levels of vitamin C and iron for Nile tilapia Oreochromis niloticus Niveis de vitamina C e ferro para tilapia do Nilo Oreochromis niloticus



Revista Brasileira de Zootecnia. Novembro-Dezembro; 316: 2149-2156



The effects of different levels of vitamin C and iron on growth performance and physiological parameters on Nile tilapia (Oreochromis niloticus) were evaluated for 73 days. A factorial experiment with three levels of vitamin C (125; 375 e 1115 mg/kg) and three levels of iron (30, 90 e 270 mg/kg), plus an additional treatment (with 0 mg/kg of vitamin C and iron), was considered on a completely randomized design, with four replicates for each experimental group. It was randomly stocked 240 reverted fingerlings, an average weight of 7.46 plus or minus 0.49 g, into 40, 250L, aquaria at a density of 6 fish/aquarium. A albumin-gelatin-diet was formulated to contain 32.0% of crude protein and 3,300 kcal/kg of digestible energy. Fingerlings of Nile tilapia fed diet without supplemental vitamin C and iron developed hypochromic microcytic anemia and the supplemental vitamin C determined the presence of immature erythrocytes on blood. It was also determined that iron serum concentration was affected by the dietary levels of vitamin C and iron and that levels higher than the nutritional requirements for the specie did not determine detrimental effect on growth performance, plasma protein production or liver morphologic traits.

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