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The aim of the study was to determine the stability of the activity of glutathione peroxidases 1 and 3 during storage at +40C and -180C. Blood samples were taken from eight sheep and the activity of the enzyme was determined in the plasma (GPx3) and erythrocytes (GPx1) on the first, third, fifth and seventh day in samples stored at +40C and after one and three months in samples stored at -180C. GPx3 activity decreased significantly during storage at both temperatures, while GPx1 remained steady even after three months of storage at -180C. Obtained results indicate that GPx3 activity has to be determined in fresh sheep plasma samples, while the activity of sheep erythrocyte GPx1 can be determined even after 3 months of storage at -180C.

THE EFFECTS OF DIFFERENT STORING TEMPERATURES ON THE ACTIVITY OF SHEEP BLOOD AND PLASMA GLUTATHIONE PEROXIDASE