Desert soil is rough, rocky, and generally inhospitable to chicken feet. Here's what has worked for me to help prevent foot injuries: for years I hauled bags of horse manure onto my chicken free range area and runs, beginning with the most heavily used portions and working my way out. I've probably composted a ton of the stuff along with the rakings from elsewhere in my yards and the coops. There is a double benefit in that the birds love to dig through the manure, especially if it's fresh, eating all the bugs and partially digested grains and such, and over time, the harsh, rocky ground has been topped over with the composted soil making it much more gentle for the chickens' feet. I rake it up periodically and make new compost piles-the fun never stops!