Here ya go, from the Naturewise website:
There more than this excerpt on that page:
http://www.nutrenaworld.com/products/poultry/naturewise-poultry/feather-fixer/index.htm
Feed for feather growth during molt, and for mite prevention.
##
Feed as the sole ration a the first sign of feather loss for hens and roosters over 16 weeks of age; transition to NatureWise Layer 16% after molting is complete
##May also be fed to laying hens and mature roosters year-round for optimal feathering and brilliant plumage
##Don't let feeders run empty
##Keep clean, fresh water available at all times
##Provide appropriate-size grit as needed
##Make oyster shell available free choice from the onset of lay
##If feeding a crumble-form product prior to feeding Feather Fixer, a week's transition of mixing the former product with the pelleted Feather Fixer may be required to encourage the birds to consume the pellets. " ( see webpage for rest of article.)
Looks like you will be fine feeding it to them.
Best,
Karen