I had 17 chickens including a rooster but they got invaded by 'beasties' at night and before I could correct the problem I went down to nine chickens with no rooster. The problem has been fixed so I bought 8 chicks about a week and a half old. I have tried to 'trick' my hens into adopting them but to no avail. So, now I have 8 chicks in a separate container and I am raising them until they are old enough to 'hang' with the hens in the coop. What I need to know is how old they should be to mix with the adult chickens and survive with the rest in the coop.