coming back to this thread to add to it. Since my post in April, I've put in wood chips twice, and grass clippings every time I cut the grass. My run is built up, dries quickly when it rains and I have no problems with any odor at all. I think adding the fresh grass clippings helps with that, and it's like walking on really soft padded carpet! and they can dig all they want, they keep it pretty well stirred up for me, so I don't have to do anything other than add to it. Oh, I've also put in any weed, dirt and all, that we pull from the garden and flower beds
This fall, I'll add leaves to the mix. I do know the chickens love it!
This fall, I'll add leaves to the mix. I do know the chickens love it!