Our chickens always had ad lib feed regardless of what it was.
We figured out though that if you want to feed them a home-made diet you have to look at the label of the pellet sack and try to reproduce that. The stuff you buy is complete and balanced (unless it says otherwise), they shouldn't need anything else but I know how nice is to treat them!

We devised a home-made recipe with wheat (whole grains), rolled oats, wheat bran, broken maize and a soya protein mix, plus vitamins and minerals (they come ready to add, a scoop or so).
So we actually had two groups of same age pullets (to become layers) and fed them ad lib pellet or home-made. At the end we found that the pellet is better for their health and egg production, because they can't choose the bits they prefer, whereas with grains mix they used to leave some stuff behind. Unfortunately the stuff they left was the protein/vitamin/mineral powder, so they were getting less than they should. Also the home-made mix tended to go off quicker (not sure why as everything was dried).
Eventually we just left them all together with ad lib layer pellets, they were happy and went foraging around but not crazy for food in the morning. If it was very wet/cold or too hot (Italian summer is HOT

), we'd prepare bran mash with either hot (if winter) or fresh (if summer) water and they loved it. Before bed, they'd go to sleep with a full crop and they seemed very happy to eat it. Sometimes we'd even put garlic in it, as the old wives tales say it helps fighting worms!! (not 100% true though, still always had plenty in them).
