My 4 hens are one year old. They have been laying well since last fall. On average I usually get 3.5 eggs per day - even during the mid-west winter. For some reason they have mostly stopped laying. I may get a few eggs a week. Also I have noticed that at least twice an egg was laid that was thin shelled and broke and was not laid in the nesting box but either outside or while the hen was roosting. Does anyone have an idea about what might be going on. They seem to be acting normal otherwise with the exception that they sit on the nesting box - with no results.