This spring I hatched out a few black orps and gave a friend of mine a feww chicks, as it turned out I only had 1 pullet so I got a couple back from him . I feed mine chick starter and then grower and their doing great, but my freind only feeds cracked corn and the 2 pullets I got back were at least 2 lbs lighter at 4 months old. Now at 6 1/2 months older their still growing but I don't know if they will be as big as the ones I fed from the start. They will survive on a diet of corn but imo will not do as well as a flock with better feed. I do know that I'm getting just as many eggs from myn 14 girls as he's getting from 30 so I think a good diet does help.