We got a couple of 1-year-old RIR hens a few days ago and they have been a joy already, each one giving us a fresh egg every day! I have a quick question about feed. We've been giving them layer's crumble and always have oyster shells available. Once in awhile we'll give them an apple core or some carrot peels or lettuce (which they love!!). I am wondering about grit. If they always have oyster shell available, do they need grit, too? In a separate dish? Any help with these questions would be greatly appreciated!