This morning I decided to try putting my 5 week old chicks with my 9 week old chicks. I have to say it didn't go to bad. I put the dog crate/kennel the 5 week old chicks have been staying in, in the middle of the run. So they would have a place to run and hide from the older chicks. At first I thought I was in trouble because my production red pullet went running toward a chick and grabbed its leg. I ran her off for a second or two and she came back and started scratching and eating with the other chicks. She pecked a few more but she was not to bad after that. My red sex links did not do to bad a couple of them pecked on the chicks little more. But there was no blood or no one got hurt. Of course I was there watching making sure no one got hurt to bad. I also want to add my 5 week old chicks have been in the dog crate/kennel aka their brooder for about 2 weeks now inside the coop. I'm not sure if that has anything to with things going fairly well or not. I have decided I'm not going put the chicks I got Saturday in with the 5 week old chicks now. They are lot bigger and probably hurt the new ones. So I will have go through this again later on. I did put my 5 week old chicks back in their dog kennel before I came back in. Since I can't be out there with them all day. I'm not sure when it will be ok to leave them together full time? I'm scared to death if I'm not out their with them one of my older chicks might hurt them pretty badly. But anyways that is my intergrating experience for now. I do have one question since the older chicks didn't seem to peck the younger chicks to bad. Should I just leave them out together all the time or should I keep the dog kennel inside of the coop still?