>>15784478It's a good thing for any species, assuming the traits being selected are favorable. If you can find something not closely related but with the same exact genes you want (unlikely), even better. The problem with incest is that it selects for positive traits and negative traits, both. So if both parents have faulty genes that are currently being supplemented by the non-faulty gene (if the father gene is shit, the mother gene takes over or vice-versa, which actually happens all the time during breeding), and they both pass the faulty one down, there's no supplementing gene to cover the problem, hence you get health problems.
