Hi,
Put the birds on Naturewise Fetaher Fixer by Nutrena :
http://www.nutrenaworld.com/products/poultry/naturewise-poultry/feather-fixer/index.htm
( for birds over 16 weeks old),.
It helps them grow out the most lovely new feathers! I used it on the advice of other BYCer's) for the last molt...