I would say yes. The first year I hatched my own chicks and when they were old enought to be without the heating lamp I put them out with the other chickens and they kept pecking at them so I took them back inside. I had to build another area outside for them. We made it next to the other chickens so they would be able to see each other all them time so when they were the same size they wouldn't fight. It seemed to work pretty well. I did wake up one morning to a dead chicken that they had pecked to death. Hope this helps.

With our hen, we had a separate pen inside the coop where mama and her babies were in. The peeps were safe and the hen took care of them, thankfully. If they got out they weren't killed, but I've been making sure to cull any particularly vicious, mean birds so it starts to favor birds with a nicer disposition.