I feed a 20% protein feed that is soy-free, corn-free with a fish meal protein. For young birds in the brooder I feed it as is. For my older birds in the coop I also supply a bowl of oyster and grow a red wheat berry/whole barley/BOSS fodder mix that is about 12% protein (I do not measure it out perfectly). I have found this mix of a higher protein feed with the lower protein supplemental fodder to be much more cost effect to help with the much higher prices of the organic feed and with the end result being a protein % appropriate for the adult birds..