Levels of vitamin C and iron for nile tilapia (Oreochromis niloticus)

[摘要] 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 ± 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 influenced by vitamin C and iron supplied on diets, and that levels above to nutritional requirements for the specie did not determined detrimental effect on growth performance, plasmatic protein or morphologic characteristics of liver.

[学科分类] 兽医学

[关键词] Oreochromis niloticus;vitamin C;iron;hematology;growth performance   IntroduçãoA vitamina C assume importância considerável em razão de ação em vários processos metabólicos