I have 14 five week old chicks I would like to intergrate with my 5 twenty week old pullets. How old should I let the smaller chicks get before I can do this? The chicks are all feathered out & look great. They are about a 3rd the size of the 20 week old pullets. They live in the same coop but are seperated, by wire. The 5 twenty week old pullets free range, but the chicks I have only let out a couple of times. Yesterday one of the baby rooster got out & tried to join the older chickens, they chase & pecked him constantly. I caught him & put him back with the other smaller ones, he was so happy. I know there is going to be a pecking order, but will the older chickens kill the smaller ones at this age? My goal is to get 12 laying hens My chickens are mostly mutt breeds. Any input would be appreciate.