My Bantams stopped laying but they also seemed to not be paying attention to the broken crab shells I threw out. They loved to peck at and disassemble them, at first. Also I used to grind up egg shells and put it in their feed. Yesterday I went and bought some oyster shells so hopefully that will get them back going. Two days ago, I put some DE on their feed and the next day one of the bantams laid an egg, in the lawn. Could this be their issue? Just not being fed enough Calcium?