When I get my first egg, I switch the birds to layer. I have several different ages so as of late I have been using All Flock or Flock Raiser depending on the brand. It is usually 20% protein. I have hanging feeders in my coops. I just add the layer or all flock to their starter/grower feed. I use pellets because the birds don't seem to waste as muck. Good luck and have fun...
As I mentioned in a previous post, you can start your birds on All Flock or Flock Raiser at any time. I have some younger birds that I have switched them to All flock at around 12 weeks old. They recently started loosing their peeps and getting their adult voices. I feed my males the same thing the females eat even layer feed. I have had no problems. In the past I used starter/grower crumbles and at around 8 weeks switched all of the birds to grower pellets. The feed store I used to get my feed from sold and the new owners aren't carrying my preferred feed. I have found another but they don't carry it either but they carry feed I have used in the past so I order it from them. I go through around a half ton of feed monthly. Now I have been using the All Flock. Again, good luck and have fun...