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SUMMARY The distribution of glutathione peroxidase ( gsh -Px) activity and selenium concentrations among several components in the blood of dairy cows was examined. Approximately 98% of the gsh -Px activity in peripheral blood was associated with the erythrocytes when enzyme activity was expressed as units per milliliter of blood. The gsh -Px activity expressed per cell was approximately fourfold greater for peripheral leukocytes than for erythrocytes. The cellular component contained a greater proportion (approx 73%) of whole blood selenium than did the plasma. A positive linear relationship ( r = 0.958) between blood gsh -Px activity and blood selenium concentrations was found in dairy cattle under practical field conditions.
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Scholz et al. (1979) studied this question.
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