We recently just moved our 2 11 week cochins and 1 10 wk EE with our 5 laying leghorns. They spent over a week of see no touch, they do free range at the same time though. 2 of the older girls are showing the little ones who's boss. Even though I hate seeing the little ones getting picked on, nothing serious has happened. On of the cochins is a cockerel, he let out an attempted "crow" only three times but he was provoked. I'm wondering since he's part of the new group if he will likely crow much much later since he's not the top chicken. He's remained quiet the rest of the time.