Pigs are not too far off when it comes to the overall body. I believe the idea to use a pig's heart is one off availability (and maybe ethics). A ton of pigs ar

Pigs are not too far off when it comes to the overall body. I believe the idea to use a pig's heart is one off availability (and maybe ethics). A ton of pigs are slaughtered each and every day, we already use several parts of a pig's body (which is a good thing, waste as little as possible). If we can successfully use it's heart for transplantation, even better. This means there is a good supply of hearts to be used.