Selenium and alpha-tocopherol content in eggs produced by hens that were fed diets supplemented with selenomethionine, sodium selenite and vitamin E
2010
Skrivan, M.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Bubancova, I.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Marounek, M.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic) | Dlouha, G.,Vyzkumny Ustav Zivocisne Vyroby, Prague (Czech Republic)
The effect of supplementing dietary selenium and vitamin E was investigated in 330 24-week-old laying hens. The hens were fed a basal diet containing Se and alpha-tocopherol at 0.11 and 26 mg/kg, respectively, or a diet supplemented with Se at 0.3 mg/kg and vitamin E between 0 and 625 mg/kg. Se was supplied as Se-methionine or sodium selenite. The eggs were collected for analysis during the third, seventh and eleventh weeks of the experiment. Supplementation of either form of Se significantly increased the Se concentration in egg yolks and whites, with a more pronounced effect caused by Se-methionine. The egg yolk alpha-tocopherol concentration paralleled the dietary alpha-tocopherol concentration. At a high dietary alpha-tocopherol concentration (632 mg/kg), the retinol content in egg yolks from hens fed Se-methionine increased significantly. Supplementation of Se-methionine significantly increased the alpha-tocopherol content in the eggs in the third and seventh weeks of the experiment. A moderate decrease in yolk cholesterol was observed in hens fed Se-methionine and alpha-tocopherol at 119 mg/kg. The concentration of products from lipid peroxidation (thiobarbituric acid-reactive substances, TBARS) in egg yolks increased marginally during the refrigerated storage of the eggs for 2 weeks. The effect of dietary vitamin E on TBARS formation was generally small, although a more significant effect was observed at the highest dose tested.
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