My chickens and ducks waste is starting to smell. I'm pretty sure it's the ducks since they are messy. The coops are spotless I clean them out every day. I put the dirty shavings in a pile at the woods edge, but today I notice a sly fox snooping by. I will be crushed if he gets my flock so I was wondering if I can use limestone to help with the smell and will it hurt my chickens or ducks?