Quote:
If your runs are roofed, then you must have a drainage problem. Have you seen this page:
https://www.backyardchickens.com/web/viewblog.php?id=1642-fix-a-muddy-run
Some of the ideas there might help you.
Dry chicken droppings don't smell (other than the cecal ones that come out wet anyway). So keeping your run as dry as possible is the key. I went ahead and roofed my big run just for this reason.