How much food will a single chick eat during the chick food phase? I've got some chicken math going on, so I'm getting somewhere between 7 & 17 chicks, and I'm trying to figure out how much food they'll need. Will one 50 lb bag of food last them the entire 18 weeks they're on chick food, or will they need more (or less)? Would a 20 lb bag be better? Will the food go bad if I have it for that long? Like, should I buy the 20 lb bag and then buy another once they've made it through, rather than a 50 lber that might be stale by the end?