I had 5 chicks until yesterday when one of my sweet girls passed at the vet after being sick and not eating all weekend. For some reason I felt the need to run out and get another chick... but you can't just get one so I got two. I wanted them a little closer in age to the girls I already have. My 2 oldest are about 9 weeks and the 2 youngest are about 6 weeks. The two that I purchased yesterday are about 5 or 6 weeks. One is definitely a Barnvelder and the other might be a Welsummer. It was suggested that rather than putting them in the brooder with the other girls I introduce them on neutral territory. So, I placed them all in the new run (that's thankfully almost finished). All of the little ones got along well. My two youngest never even noticed new chicks were around. The older girls, however, weren't having it and my feisty one, the SLW started pecking them on their heads and back. I stayed outside with them all for about an hour and then got out a dog kennel to put the two new girls in for the adjustment period. The way the other brooder is built (deep wooden box) the girls aren't able to see each other but my plan is to put them out in the run together (keeping the younger girls in the wire kennel) and allowing them to get used to one another. My questions are, how long does this transitional period last? Will my older girls welcome, or at least tolerate them eventually? What else can I be doing to move this along? Any and all advice is welcome here. Thank you.