Hi, I have been keeping up with Back Yard Chickens and decided to join. I have had chickens for about 3 years all Rhode Island Reds. We have added Barred Rock, Buff Orpingtons , and Black Sex links. We have had the new ones about 4 months. My question is when would it be safe to put them with the older hens. I have plenty of room for them all to be together, as much as I would like to free range them there is to much activity with a busy highway and dogs. Thanks in advance for any advice I can get.