Answer:
If you analyzed the blood from the pulmonary vein of any mammal, you would find the highest concentration of oxyhemoglobin.
The pulmonary vein carries oxygen-rich blood from the lungs back to the heart, and oxyhemoglobin is the main form of hemoglobin in red blood cells that transports oxygen from the lungs to the tissues of the body.
Carbaminohemoglobin is formed when carbon dioxide binds to hemoglobin in the red blood cells, but its concentration is lower than that of oxyhemoglobin. Bicarbonate ions are formed as a result of the conversion of carbon dioxide in the blood and are present in the plasma, but their concentration is much lower than that of oxyhemoglobin in red blood cells. Reduced hemoglobin is hemoglobin that has lost its oxygen and is ready to pick up more oxygen from the lungs, but again, its concentration is lower than that of oxyhemoglobin in the pulmonary vein.