These little birds are more active than my white Cornish X birds are. As soon as they are big enough to stay in a horse stall, I will let them into one. For now, I just keep upsizing on cages because I'm afraid they would slip through the door gaps if I let them into a stall. I can't let them free range though, because other than a 200+ lb wild caught pet hog (opportunistic feeder), I also have 4 aussies and some hog hunting dogs - all of whom would love to get their paws on some fresh chicken. The Aussies are good with the birds, especially when I have escapees, but I am also there to call them out. Without supervision, I'm afraid an escaped meat bird would have no chance. We also have a very non skittish coyote visitor living in the back pasture. I have a bad problem with being over protective, but I figure I'd rather be safe than sorry. Therefore, my meat birds are living in 12 x 12 horse stalls.
Cheers!
M