I have two white leghorn hens that have only been laying about three weeks. As soon as they started I switched to Layena and started mixing oyster shell into their food. Only on one or two occasions did I get two calcified eggs. Normally I get one good egg in the nest box and a noncalcified egg on the coop floor. I am in the process of identifying the hen dropping the bad eggs but just wanted to know how long I should try to work this out before she is deemed a "loss".