The Ethics of Zena Transplantation

Cardiologist, doctor rohem francis on the ethics of zena transplantation. There are currently six thousand people waiting for an organ transplant in the u k. We already use heart valves made with pig or cow tissue to replace ones that are failing in humans. It is much easier to justify using animals to save lives, rather than just as a sunday roast. Most i've spoken to feel that this is an acceptable case. But what if the transplant is not life saving, but life improve such as a corneil zeno transplant, which has been performed in china? Where does one draw the line?