Why Is There No Pig Milk Cheese?

In the netherlands, there is a family farm called piggy's palace, and they produced a block of cheese made pig's milk. The money was being donated to a children's cancer charity. Pigs have been used for things like skin grafts for humans, and i know there is talk a while back of pig organs being used for transplantation r things like kidneys,. where we need a lot more. I believe pig heart valves have been used. And so that means that even if the use of pig parts is not cosher or legal according to jewish law, that when some one's life is at stake, you are actually not only not forbidden, but commanded to do what