Cows had higher oxyhemoglobin saturation but a lower hematocrit than calves. This is important because low oxyhemoglobin saturation is predictive of pulmonary hypertension in both cattle and broiler chickens.One might anticipate calves to have higher oxyhemoglobin saturation than cows, since fetal hemoglobin, which has high affinity for oxygen, is detectable in calf blood until 6–7 months after birth