I'm not certain if this is the right place to post, but I'll give it a try. My Delaware hen, who is close to a year old, and has been laying since the fall, lays eggs that are very thin-shelled compared to the other girls, and have a matte (as opposed to eggshell!) quality to them. What I mean is that they don't seem to have the same shiny smoothness that the other ladies' eggs have. So they seem to be a little permeable--when I boil them, they have a little air pocket at the end, and when it's wet like now, and the girls have muddy feet, the mud doesn't wash off easily the way it does off of the other eggs. She has access to all the same food that they do, and seems healthy, although she sometimes has some poop that cakes around her cloaca. She may be lowest in the pecking order, but she definitely gets adequate access to the food. I have tried worming. Sometimes, when the eggs are particularly thin-shelled, she seems to know, and lays them on the ground instead of in the nest box. Any ideas?