When a bone is cooked in the oven is calcium taken away from it?

Cooking a bone in the oven does not remove calcium from it; rather, it can alter the bone's structure and make it more brittle. The heat may cause some organic components to break down, but the mineral content, including calcium, generally remains intact. However, prolonged cooking can lead to the leaching of some minerals into the surrounding liquid if the bone is simmered or boiled. Overall, cooking modifies the bone but does not significantly reduce its calcium content.