I have a strange condition happening with my little muscovy hen. She is now a "pet" due to her loosing her toes & webs to last winter's early freezing temps and she was a late hatchling. She doesn't have "angel wing" but something else going on with her feathers. The newer pin feathers are "knobby" in appearance & arent' forming correctly. I can't figure out what I could be feeding her that could do it since she gets the same feed as the other ducks that are out in the duck house. She got sprouts, cooked green beans and lettuce over the winter as well as scratch & wild game bird feed. So what can cause the feather shafts to be "knobby" with lumpy spurts of growth in their appearance? I will try to post a picture of her close up asap.