We used a roller pen a couple years for our fryers and it works great. they get feed from grass and in turn fertilize the fields.I'm building mine mobile with a removable floor so I can move it then pull out the floor and hose it down. We will see how it goes or if it becomes more trouble then worth.
the reason I added the crushed limestone was because the rain wouldCindy,
I would love more info on the crushed limestone. Do you then, scoop out poop ? What happens in rainy weather ?