I know you guys are probably sick and tired of this question as I see several topics already started, but I think this is a different enough of a situation to start a different thread. My FIL picked up 12 chicks about a month ago. At the time there was about a 2wk difference in age and I'm not really sure he realized that. He had them all in one brooder and within a couple of weeks, a couple of the bigger ones were feather pecking everyone else. I told him he needed more space so he got another brooding space and separated them by age. Well he can only keep 6 in town (the rest are going out to his farm) and originally it was going to be a mixed up flock but the smaller birds are all barred rocks with a random australorp thrown in there. The bigger birds are red sex link and production reds. The bigger birds are now hanging out in a small coop/run outside but the littler ones still need more temperature protection so they are inside and outside depending on the weather. My question comes, if he wants to mix these two groups up keeping some of the black ones and mixing some of the red ones, will it be easier if he goes on and does it now, or will a couple of weeks not make much of a difference? Does it matter that the bigger birds would have to go back to brooder confinement after being "free" if he does it now?