I have read that you should integrate when they are about the same size... or full grown. I have 4 BO pullets that are supposed to be about 10 wks old but I swear they are either the same size as some of my other hens (mixed leghorn and amaracauna) or about 2/3 the size (BR and FBCM). I also have 2 in that coop that are bantams. Right now there are 15 in a 12x40 coop. How much longer do I need to keep the BO separate? Thanks!