Resumo

VINCHIRA, J. E; WILLS, G. A  e  MUNOZ, A. P. PRODUCTIVE PERFORMANCE, COMPOSITION AND RELATIVE SELENIUM BIOAVAILABILITY IN NILE TILAPIA -Oreochromis niloticus- SUPPLEMENTED WITH ORGANIC AND INORGANIC SELENIUM. Rev. Med. Vet. Zoot. [online]. 2014, vol.61, n.2, pp.186-202. ISSN 0120-2952.  https://doi.org/10.15446/rfmvz.v61n2.44681.

The aim of this study was to evaluate the productive performance, whole body selenium retention and relative selenium bioavailability in Nile tilapia (Oreochromis niloticus). A practical basal diet was supplemented with either sodium selenite or seleno-yeast at tilapia fish (n=336) with an initial weight of 13.41±0.12 g were randomly distributed into forty-eight glass aquaria (80 l, 4 replicates, 7 fish per aquarium). There was no detectable selenium in supply water. Fish were fed the experimental diets to apparent satiation three times daily for nine weeks. Selenium supplementation did not affect the productive performance of Nile tilapia (P>0.05). Total whole body selenium increase linearly in response to dietary selenium supplementation (P<0.05). Fish fed sodium selenite had lower (P<0.05) whole body selenium (1.67±0.14 mg/kg) compared to fish fed seleno-yeast (1.95±0.21 mg/kg). Based on the slope-ratio assay for whole body selenium, the relative bioavailability of seleno-yeast was 155.72%±0.10 compared to sodium selenite (set at 100%). According to results the basal selenium content in expegraded selenium levels (0.0, 0.10, 0.20, 0.40, 0.80 and 1.60 mg/kg). Reversed Nile rimental diets (0.21 mg/kg) did not limit the productive performance of Nile tilapia. Supplementation of inorganic and organic selenium (0.10-1.60 mg/kg) did not affect the productive performance of Nile tilapia.

Palavras-chave : Bioaccumulation; relative bioavailability; selenium-yeast; sodium selenite.

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