I have 7 chickens who are 4 months old, not yet laying, my friend is giving me 6 of her chickens who are laying. How do i go about having the two flocks living together when they need different type of food? Or can I feed the adult hens start and grow food until the other 7 are old enough? But then future wise if I have babies and move in teenagers into the flock, how do I go about feeding them while also feeding my layers their feed? Also, do I have to worry about my teenage hens trying to establish a pecking order with the adults? Even the teens will try to fight the adults? And why isn't layer feed good for roosters? I have two.... Thanks for the provided advice though. I'll make my birds chill with the goats for a week and let the adults have the coop. Last Question: So if I feed all flock all purpose feed to all my chickens no matter age, gender, etc. do I have oyster shells available free range? Would it be okay for a chick to eat it? or a rooster? Or will they tend to stay away from it?