Percent hemoglobin oxygen saturation was measured with a pulse oximeter in 6-week-old slow-growing (light) and fast-growing (heavy) male broiler chickens and those with ascites from right ventricular failure (RVF). Pulse rate and percent oxygen saturation were read from the ulnar artery just proximal to the carpus. Percent oxygen saturation was significantly (P less than or equal to 0.0001) higher in light chickens (mean 91.6%) than in heavy chickens (mean 86.0%), and the percent oxygen saturation was significantly (P less than or equal to 0.0001) higher in both groups with normal hearts than in the group with RVF from valvular insufficiency (mean 62.1%). All RVF chickens and those with normal hearts were confirmed at necropsy. Light chickens were males with leg deformity or stunting and were 20-50% lighter than the heavy chickens.
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