I have averaged twenty to thirty chickens in the same pen for 15 or more years. It has a high roof, wire walls and dirt floor and I occasionally put down a thin layer of straw. I clean out the bedding in the laying boxes a few times a year and throw it on the floor as well. Of course it's well ventilated, not much odor at all. I ran a tiller through the pens once and I have shoveled out some of the top layer a few times. Thats about it; the chickens are happy and healthy.
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