I saw a guy mention the other day that he feeds his layers egg shell. This makes so much sense to me as a way of getting the calcium the birds need to make shells back into the birds. It did, however, make me wonder what precautions need to be taken. I assume they would either need to be rinsed really well, to get the egg white off, or microwaved long enough to cook any egg residue. What else? Run them through a coffee grinder so they are not recognizable as egg shells? I would hate to remind the chickens that eggs are yummy!