They do have a treat ball that I put an apple or a roll in every other day.
I think it might be one bird that's snagging the feathers as I notice the quick(er) birds manage to avoid her and their plumage is intact. (And what should I do about that bird?)
I'll go get some canned mackerel this afternoon. Perhaps I should switch back to the grower crumbles @ 20% protein? I just like the cleaner aspect of pellets. They do have free choice grit and oyster shell in the coop. I'll make their mash a combo of ricotta cheese, dried meal worms and Calf Manna (25%) for a week and see if that alleviates the situation, also, to try to raise the protein aspects.
Is it worth getting Feather Fixer feed?
I did put in a "privacy bar" (an added 2" rim) to the nest boxes which makes it a bit more difficult for the other birds to pick at the ones sitting on the nest.
Thanks for the suggestions!