Effects of Hypoxia on Activities of GPx, GSR and GST in Tibet Chicken and Silky Chicken Hearts

This study was performed to investigate whether differences exist in activities of Glutathione Peroxidase (GPx), Glutathione Reductase (GSR) and Glutathione S-transferase (GST) in hearts between Tibet chicken and a lowland chicken breed (Silky chicken). At the end of 5 days of age, 24 chicklings of each breed were divided into 3 groups treated with three different oxygen concentrations, respectively for 20 h. Activities of the three enzymes in chicken hearts were determined spectrophotometrically.