One of my hens is laying rubbery shelled eggs. Two in the last two weeks, today she laid an egg that was just the white membrane and a full egg in the coop. I think it is the hen that is molting right now, but, I'm not sure. I have given them the best laying feed, crumble, oyster shell openly, all kinds of vegies, fruits and yogurt. Today is cold, they got some warm oatmeal this morning. My hens are over a year old, but not much. They have been laying for over 6 mos. like clock work we get 4 eggs a day, (4 hens). On really cold rough days we only get 2 or 3. They also get diatomaceous on their food, coop and bodies. Any one have an idea if the molting can cause thin shell. The other hens shells are like bricks, takes alot to crack them.