The glutathione redox system of pheasants was investigated with measuring the reduced glutathione (GSH) content by the method of Sedlak and Lindsay (35), and glutathione-peroxidase (GPx) activity according to Lawrence and Burk (36) in blood plasma, red blood cell haemolysate and the 10,000 g supernatant fraction of liver homogenate. GSH content and GPx activity were calculated to protein content. The protein concentration was measured with the biuret reaction (37) in blood plasma and red blood cell haemolysate, while the method of Lowry et al. (38) was applied for the 10,000 g supernatant fraction of liver homogenates.
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