Influence of diet on selenium (Se) toxicosis and oxidative stress in mallard ducklings
Conference
·
OSTI ID:218477
- National Biological Service, Laurel, MD (United States). Patuxent Environmental Science Center
High concentrations of Se have been found in aquatic food chains associated with irrigation drainwater and result in toxicity to fish and wildlife. Both quality and composition of diet including protein for wild ducklings may vary in Se-contaminated environments. The authors compared the effects of Se (as seleno-DL-methionine) at different concentrations of dietary protein and methionine supplementation in mallard (Anas platvrhynchos) ducklings. Further comparisons were made among different forms of Se, including seleno-L-methionine (L), selenized yeast (Y) and selenized wheat (W) using a wheat-based diet and a non-wheat diet. All forms of selenium with different diets caused significant increases in plasma and hepatic glutathione peroxidase activities. Antagonistic interactive effects occurred between supplementary protein or methionine and Se. These included partial to complete alleviation of the following Se effects: mortality, hepatic lesions, and altered glutathione and thiol status. Se as L with the wheat-based diet was the most toxic, resulting in high mortality (64%) at 30 ppm and impaired growth (> 50%) and increased ratio of oxidized to reduced glutathione, Se as Y accumulated the least in liver compared to other forms. In a subsequent experiment with a non-wheat diet, Se as L was less toxic, These findings suggest the potential for antagonistic interactions between Se and dietary protein and methionine.
- OSTI ID:
- 218477
- Report Number(s):
- CONF-9511137--; ISBN 1-880611-03-1
- Country of Publication:
- United States
- Language:
- English
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