I was looking on different sites before and also on here for a general topic on captive breeding standards. I found a few scattered conversations but didn't find a thread specifically to this topic sorry if there already is one but this is a topic I find myself quite ignorant on. In the case of tigers & leopards, which are endangered species broken into several sub species: what is the standards for captive breeding? If a reliable zoo suddenly found out a Sumatran tiger it was holding had a great grand parent with Amur genes, would it effect the zoo's decision to breed from that animal? I understand recently quite a few Amur tigers in captive zoos throughout Europe, were found to have Sumatran genes & are no longer to be bred from. Is this because these tigers have direct lineage from Sumatran ancestors, or from ancestry several generations back?