There seems to be a bit mixed thoughts on angel wing. It could just be a bit much protein in the feed. We had a couple girls start getting it, we wrapped their wings for about a week and I added some oats to feed for a few weeks. I used a feed calculator to figure how much oats to drop the protein of my feed down a couple percent. I have read there could be genetic issues, and some saying because of that breeding isn't recommended. To me it seems if you are not going to be raising them for production it would probably be fine as pet ducks as it really probably wouldn't be much an issue to just feed some lower protein feed with them since you are not breeding for that growth rate and needing to "fatten" them up beyond a healthy diet and weight. If wanting to breed for show it could run into same issues if it is genetic and is passed to the offspring also.