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Al they are using set-ups like this in the UK for free ranged birds. The barns are floored with curtain sides that can be rolled up for access to pasture. There are roosts and nesting boxes in the barn along with the waterers and feeders. When it is time to move to another pasture they roll the sides down after the birds have gone to roost, hook a big tractor on ot and pull it to a new pasture. This will also help keep parasites and sickness at bay too.
The poultry raising portion of Heifer International's farm works similarly to this also. Their large chicken tractors are moved by tractors daily in a large, flat pasture, so the turf is not damaged and the manure keeps the pasture very fertile. They are an inspirational group altogether, raising nearly all their food, including a huge coop vegetable garden. Of course, they are much, much more than that--that's only a miniscule portion of their overall operation.