Seasonal variation of glutathione peroxidase, CK and AST in sheep in a low-selenium region
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Department of Animal Pathology, Veterinary Faculty of Lugo, University of Santiago de Compostela, 27002 Lugo, Spain
Publication date: 1997-08-19
J. Anim. Feed Sci. 1997;6(3):343–351
Blood glutathione peroxidase (GSH-Px; E.C. activity, a measure of selenium status, as well as the plasma indicators of muscle damage creatine kinase (CK; E.C. and aspartate aminotransferase (AST; E.C. were evaluated in sheep in a region with low selenium levels during the spring and the summer, because this time may be critical for suffering selenium deficiencies. GSH-Px activity was highest during the spring, when mean values ranged from 74.16 and 90.51 Ul/g Hb, descending drastically during the summer, below physiological levels (P < 0.001) with mean values ranging from 43.33 to 50.01 Ul/g Hb. GSH-Px activity, within the deficiency range, registered during the summer did not originate muscle damage, since the muscle enzymes CK and AST were within their normal range.
Effects of selenium depletion and selenium repletion by choice feeding on selenium status of young and old laying hens
Christine A. Zuberbuehler, Ruth E. Messikommer, Myrtha M. Arnold, Rhea S. Forrer, Caspar Wenk
Physiology & Behavior