My 21 week old BR roo keeps eating all my oyster shell. I have a container out for my 2 layers, my other 4 girls are at 20 weeks and not laying yet (any day now ) and so I have them on 18% (I think) grower crumbles. Until about 2 weeks ago I would have to fill the container with oyster shell about once a week. Then I noticed my roo was eating the oyster shell a lot when I was out with them and I have to refill about every 2-3 days! I've been observing and he has no trouble getting to the feed, and treats I often give consist of cheese, yogurt and grapes. Does anyone know why he's doing this? Could it hurt him? Thanks!