everytime i clean our woodstove out, I dump the ashes in a drycorner in their run. They love it. I also have 2 white leghorns that stay white. I was using just Buhach...but I read that wood ashes particles are so small that the dust chokes out mites and lice. So I use ashes now, and this spring I might dump some more Buhach. It hasn't made any of them sick....they don't set out to eat it. they do run over and all start rolling before I'm done dumping the ashes.