My speckled sussex began laying eggs in August. She was never as regular as my other two hens and her eggs didn't get larger as quickly as my other hen's eggs. She was laying maybe 3 or 4 eggs a week for about a month. In September she stopped laying and then one morning I found two shell less eggs under the roost. About 4-5 days later I found two more shell less eggs under the roost. I started putting out a try of oyster shell at this point. I had been mixing it in their food, but decided a big tray full might help. So, after that, she layed one normal egg in the nest (shell still rather brittle). Then several mornings later I found another egg under the roost - but it had a brittle shell. (Why under the roost?) The next day - back to a shell less egg under the roost. I don't know what else to do at this point. Any suggestions?