I use hydrated lime in my pens. However, I've read that if their feet are wet and they walk in the lime it can burn them. I used it in one coop with a wood floor, and the hen that stayed mostly in that house ended up with foot problems--I think possibly from the lime. In the places with dirt floors, it helps a lot, mixing with all the stuff, including chips, on the floor to break everything down. I've had no problems where it is dry.
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