First why did you make that stupid law that always hits me? (Murphy's law)
I hate to agree with others here, because I am a contrary ornery old coot, but I do not understand why you want the dog crate either.
As far as combining flocks it can go good or it can go bad, I have a rooster, (Yes, I said rooster) that makes it go easy. I move my chicks and poults into a tractor right in the middle of the chickens free ranging area, about 10 feet from their waterer. My Wife and I also do Chicken TV time there also. In a week the chickens just forget the chicks were not always there.
We let the chicks out to free range during the Chicken TV time first then all day long. Before you know it they are all one flock.
The rooster takes the chicks under his wing, no one dare touch his chicks. He will protect them all day long.
Here is a picture of Ed protecting newly released chicks. If you blow up the picture you should see a chick on Ed's back and sitting right next to him. He will sit with the chicks for days to make sure they are not attacked by other birds.
Since the picture was taken I have refined the tractor design, but they are made of junk wood so they are not all that pretty. Also my wife made me clean up my scrap iron pile. I know that is unreasonable, but she is the daughter of the wicked witch of the south so I dared not defy her.
Edited by duluthralphie - 3/17/16 at 5:34am