In the experiment, twenty. 10-12 weeks old chickens were used to determine arterial (n=10) and venous (n=10) blood gases and some electrolyte levels. Arterial pH. HCO³, pO₂ saturation and O₂ content levels were higher than in venous blood, whereas pCO₂ and total CO₂ were found to be higher in venous blood. Although there were no differences between groups, plasma Na⁺, K⁺ and Ca⁺⁺ levels were determined slightly higher in venous blood than in arterial blood.