I've been told, and it makes sense to me, that most horse's back feet turn out. Something about their legs not hitting their rib cage when it motion.
It does seem like most horse's hinds turn out a bit. Humans like things straight, but the older I get the more I think we should not monkey around trying to "fix" conformation issues and realize that nature sometimes knows best. My vet seems to be a big believer in that as well.
Wow! Very interesting.....I wouldnt be surprised if that was true ;) I know Rodeo's feet turn out in the hind, but his fronts are straight!