Yesterday it was hot and one of my hens went in the coop to try to lay an egg a few times but had no success. She didn't seem distressed, though, and free-ranged in the afternoon and her energy seemed good. This morning I found an egg in the coop when I let them out at 6 a.m. I'm assuming it is hers, but it could be her sister's, as I didn't see who laid it. Her sister laid a perfect egg yesterday. Her sister has been known to lay 2 eggs in one day, but not recently. They are both 16 month old Barred Rocks. This egg I found this morning is odd looking. It has a large white ring on it. The egg is a dark brown. I checked out the eggshell defects site but saw nothing like this. What do you think would have caused the white ring? I have read that it's harder for chickens to lay eggs in hot weather. I have been trying hard to keep them hydrated.