Justin Stane told me that he can identify LMB that focus on artificial feed just by looking at their coloration. I think (may be wrong, hopefully somebody will correct me if so) he meant that they are less well camouflaged. Pellets are easier to sneak up on than CNBG!
Whether they pass along this trait, I don't know. If so, would be a case of de-evolution, the loss of genetic information when doing so confers a survival benefit of some sort in a particular situation. Eyeless fish & amphibians in caves are a good example.