I'll speak to Jews. There is no such restriction or even preference. Not only is this not a problem, Israel does a lot of research on creating pigs that are co

I'll speak to Jews. There is no such restriction or even preference. Not only is this not a problem, Israel does a lot of research on creating pigs that are compatible with humans. Jews have no issue with pig heart valves. In general, the idea is that in Judaism human life is critical. You do what it takes to save lives. Only after that do the rules matter.