I use whatever food I hae on hand. The young chicks get hard boiled egg from day one. At about 4wks I start adding other things like mealworms, grass/dandelions, fruits and veges with chick grit. I have an Amberlink that doesn't let me pet her, but she knows who has the good treats and comes running when I open the coop door. She was part of my first batch of chicks that never got treats, though. My others all run to me when they see a plate or my hand in the brooder. My BRs and the RIRs are the best - they flop their chests in my hand and let me rub them. The SSs are overzealous and like to try to eat my fingers, too. Yep. as with men, the way to a chicken's heart is through it's stomach!