Feather Advice......

Hi, All

Ive had my chickens a week now, they are ex-bats, so had some feathers missing from around neck/head area, plus other parts, they seem to be doing ok, im just wanting to know if im doing things right, and if there is anything i can do to make the feathers come back? They eat mainly crumb, which i assume they have been used to all there life, i have introduce a mix of crumb, layers pellet and grit in there food, and they seem happy along with the odd worm or two...will the feathers and comb go back to normal in time? or is there things i need to give the hens?

Cheers

Rich_Chicken