I think it depends on what you consider a large run. I have my coop surrounded with 650' of electrified poultry net. The netting/fence is 4' high. My chickens, including 4 BRs, are perfectly content to stay in their area. They once freeranged all over the place. But the resident foxes discovered them, and they have to be fenced in for their own protection. When I first got the fence, I had one chicken (An EE) out of over twenty, go over the fence the first day it was up. I clipped one of her wings, and that fixed that. The fence has been up going on 4yrs.