Boone Farm
Songster
In all the video's Ive seen on integrating new birds they seem to do the same. If you can let the birds see each other for a week or so without having the ability for them to actually touch each other [dog cage, etc], they seem to have success. That being said, I haven't had any personal experience there.
Then there is the fact that we will only have 4 hens left (hopefully, my God I will totally lose it if more of them end up roosters). I'd like to find a couple other hens around their same age so I can add them in while they're still young and no one kills one another. 