I have 2 1/2 week old Jumbo Cornish X Rock males that are loosing their little minds in the brooder. We didn't expect them to get so big so fast, and so we got lazy and haven't completly finished the run yet. We're hoping to get that done this weekend so they can be moved out of the basement kiddie pool brooder. I'm wondering how young is too young to start feeding them greens. I have some rinsed remants of lettuce leafs that I used in my husbands salad that I thought would occupy them. I know these are okay to feed, but is it okay to feed to chicks that young?