Ok, good to know, thanks! They spend most of the day foraging in the garden, so I'm never really quite sure what they are eating. I think I was overestimating what they should be eating in terms of their regular food.
When I went to clean the coop this morning I found an egg, yolk in tact, with completely no shell, in the poop tray (girls are in an eglu). It literally looked like someone had cracked an egg in there. They only ever lay in the nesting box, so it feels like she didn’t even count this as an egg...