I have two dishes screwed to a scrap of plywood on the coop floor near a feeder. The "dishes" are the bottoms of plastic soda pop bottles.
I would never add either item to their food. They will take what they need, which may be little or even none. Some of my chickens use the grit and oyster shell a lot more than others, from what I've seen.
I would never add either item to their food. They will take what they need, which may be little or even none. Some of my chickens use the grit and oyster shell a lot more than others, from what I've seen.