Abstract
A nutrition trial was conducted on juvenile common carp (Cyprinus carpio), initial mean body weight 15 ± 0.4 g within a controlled facility at 25 ± 0.5°C. Six diets containing various levels of supplementary Cr (0, 0.2, 0.5, 1.0, 1.5, and 2.0) mg Cr/kg of diet as Cr chloride hexahydrate were fed to carp for a period of 10 weeks. Lower growth performance was observed in fish fed on the control diet and the diet supplemented with the highest level of Cr (2.0mg Cr/kg). Although fish fed 0.5mg Cr/kg showed the best growth performance, this was not significantly different (P>0.05) from fish fed 1.0mg Cr/kg. The regression of plasma glucose concentration was linear (R(2)=0.97 and P value=0.001) as the Cr content of the diet increased (up to 1.5mg Cr/kg). Cr carcass content was elevated with an increasing level of dietary Cr supplementation up to 1.5mg Cr/kg; but fish fed on the diet supplemented with the highest level of Cr (2.0mg Cr/kg) showed a decrease in Cr carcass content. Histological examination to evaluate the impact of different Cr supplementation on liver and gut tissues showed notable changes. The higher level of Cr (2.0mg Cr/kg) in the diet gave rise to elevated hepatocyte vacuolization and changes in gut tissue morphology. It appeared that Cr chloride significantly improved growth within a defined range (0.2-1.5) mg Cr/kg without any negative impact, while 2.0mg Cr/kg in carp diet seems to be the threshold for the initiation of toxicity.
Original language | English |
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Pages (from-to) | 45-51 |
Number of pages | 0 |
Journal | J Trace Elem Med Biol |
Volume | 27 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 2013 |
Keywords
- Animal Husbandry
- Animals
- Blood Glucose
- Carps
- Chlorides
- Chromium
- Chromium Compounds
- Dietary Supplements
- Liver
- Starch
- Weight Gain