I suspect it may be a genetic thing that could be more prevalent in an area because if some of you guys have them as common as you do that is unique. They are not common. Between myself and other hunters I have seen quite a few birds killed and can only think of my 1 and another one over the years.
As for coming from bearded hens I would question that unless you showed me some biology on that. I suspect that is just pure anecdotal observations (in other words the DNR guy has no clue and is blowing smoke).