Distribution of glutathione peroxidase activity and selenium in the blood of dairy cows.
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.
D000818:Animals; D002417:Cattle / Q000097:blood*; D004912:Erythrocytes / Q000201:enzymology; D005260:Female; D005979:Glutathione Peroxidase / Q000097:blood*; D010544:Peroxidases / Q000097:blood*; D010949:Plasma / Q000201:enzymology; D012643:Selenium / Q000097:blood*
D010544:Peroxidases; D005979:Glutathione Peroxidase; D012643:Selenium