ORIGINAL PAPER
Antioxidant and selenium status of laying hens fed
with diets supplemented with selenite or Se-yeast
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1
Institute of Animal Physiology, Slovak Academy of Sciences,
Šoltésovej 4, 040 01 Košice, Slovak Republic
2
Slovak Agriculture University,
Tr. A. Hlinku 2, 949 76 Nitra, Slovak Republic
Publication date: 2006-07-05
Corresponding author
V. Petrovič
Institute of Animal Physiology, Slovak Academy of Sciences,
Šoltésovej 4, 040 01 Košice, Slovak Republic
J. Anim. Feed Sci. 2006;15(3):435-444
KEYWORDS
ABSTRACT
The experiment was designed to investigate the effects of feed supplementation with selenite or
selenized yeast on parameters of antioxidant and selenium status of laying hens.
Hens of laying breed Shaver Starcross 288 were randomly divided at the day of hatching
into 4 groups and fed for 9 months on diets which differed only in amounts or forms of selenium
supplemented. Group 1 was fed the basal diet (BD) with native Se content 0.1 mg·kg-1 DM. Groups
2 and 3 were fed the BD diets supplemented with equivalent Se dose 0.4 mg·kg-1 DM of either
sodium selenite or Se-yeast, respectively. The diet for group 4 was supplemented with Se-yeast
at Se dose 0.9 mg·kg-1 DM. The activities of glutathione peroxidase (GPx) in blood and tissues
of liver, kidney and duodenal mucosa were significantly increased by Se supplementation, but
no differences due to form or dose of Se were observed. Both Se sources resulted in significant
reduction of superoxide dismutase (SOD) activity in erythrocytes. Malondialdehyde (MDA)
content in kidney tissue was reduced by both Se sources, but its production in liver tissue was
inhibited by Se-yeast only. Selenium supplementation did not influence the levels of MDA and
-SH groups in plasma. Although both Se significantly raised Se concentrations in blood and tissues
of liver, kidney, spleen, hearth and duodenal mucosa, significant Se deposition into muscles
appeared in hens given Se-yeast only. The presented results suggest that Se-yeast is more effective
in maintenance of antioxidant and selenium status of laying hens than selenite.
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