You might want to check out this site
http://www.wetwebmedia.com/feather.htm
that's where I got some info or faqs on feather dusters when ours lost his feathers, he's still in the tube just take some zooplankton and shoot it into his tube is what we did, ours is doing great and like FF said they will regrow them and it's amazing how fast they do. Don't give up on him