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Abstract
The aim of this study was to evaluate the rate absorption of radio-labeled chromium oxide (51Cr2O3), used as biological marker in nutrition studies with Nile tilapia Oreochromis niloticus. An experimental diet with approximately 58 µCi of specific activity of the element was encapsulated and fed daily to 35 adult Nile tilapia; a group of 35 fish was used as control feeding on a basal diet. At the beginning of the experiment five fish from each group were randomly selected and blood samples were drawn from control (BC) and experimental fish (BE). Fish were then euthanized by anesthetic overdoses and samples of the liver tissue (LT), renal tissue (RT), stomach without content (S), intestine without content (I), gills tissue (GT), muscle tissue (fillet; MT), visceral fat (VF), content of the digestive tract (CTDE) and water aquarium were collected from the experimental fish. The procedure was repeated daily for one week. Simple linear regressions were adjusted - days of collection vs. determination coefficients, and were established for statistical comparisons of the measured activity of 51Cr readings in sampled blood and tissues (logarithmic transformation) for samples of the control and experimental fish. No differences (P>0.05) were detected between samples from BC fish and BE, RT, VF, MT and LT of treated fish, but samples of GT, I, S, CTDE and WA from the tanks holding fish which received the experimental diet differed from control (P<0.05). The experimental results indicate that the trivalent chromium in the form of 51Cr2O3 was not significantly absorbed by the gastrointestinal tract, gills or another possible route of absorption under these experimental conditions and with Nile tilapia. Therefore, this marker was shown to be inert and can be safely used in nutrition studies.
Highlights
MATERIAL AND METHODSThe feedstuffs nutritional value can be measured by the apparent digestibility coefficient (ADC) of ingredients, that is, the percent of ingested nutrients not recovered in fecal excretions
Fish were euthanized by anesthetic overdoses and samples of the liver tissue (LT), renal tissue (RT), stomach without content (S), intestine without content (I), gills tissue (GT), muscle tissue, visceral fat (VF), content of the digestive tract (CTDE) and water tanks were collected from the experimental fish
To determine if there was absorption of chromium as a marker, through the digestive tract of Nile tilapia, blood samples were compared to adjusted regression from control fish, with regression adjusted samples of visceral fat, liver tissue, muscle tissue and kidney tissue of fish that received the experimental diet and those did not differ among themselves (P>0.05), and so are characterized as belonging to a single linear regression
Summary
MATERIAL AND METHODSThe feedstuffs nutritional value can be measured by the apparent digestibility coefficient (ADC) of ingredients, that is, the percent of ingested nutrients not recovered in fecal excretions. The level of chromic oxide added to the diet was only 0.01% and according to the authors mentioned above, at this small rate the chromium would lead to increased absorption by the digestive tract and would be more readily detected in experimental fish samples.
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