I have great success breaking my broodies with wire bottom cage. I don't hang it tho. I took some plans for a quail hutch I made for Rainwolf and adjusted them a bit. I have a 2'x8' 'hutch' that has 4 separate 'cells'. Broody hens go in there and two or three days later I let them back into gen-pop. So far that has cured them. Oh -- the do kinda freak out the first time you set them down on the wire floor -- suspended 2' off the ground. So maybe the key (considering CR's post about hanging the cage) is that you need the floor of the cage a few feet (or more) off the ground.
PS - does anyone else use prison vernacular to describe their chicken set up? I have a 'compound' - general population - jail - solitary confinement - infirmary - exercise yard - juvenile detention
