I have a borrowed Barred Rock hen with 4 8-week old chicks. They are all in our dog kennel with a heat lamp and doing very well. I have to give the mama back to her owner sometime and am wondering when I can move them into the roost with the 4 other hens and rooster. It gets pretty cold here at night (sometimes but rarely below freezing) so I could move their heat lamp with them for cold nights. Will the other hens pick on the mama and chicks? Thanks for your advice.