I have a hen that is about 18mos old or more. She layed just fine until 3mos ago she started laying eggs without shells. Of course she ate them. Since then I have increased her calcium a lot. Now she lays about 1 egg a week with a shell and the rest with no shell. I can tell b/c the nest has a wet spot. Her eggs are very large so she only lays about 3 per week and I am getting 1. I am thinking about culling her b/c I have chickens for the eggs. They are great pets but I raise them for the eggs. Q is has anyone else had this problem? IF giving extra calcium fixed it every time I would continue but it does not. Otherwise she is in great shape.