I got my first brown egg today from, I think my Barred Rock. I don't know for sure who laid it, but I found it when I got home from work. It was laying on the floor by their food. I don't know how long it had been there because I leave for work at 6:30 am and it is still dark when I open their little door. I just know it wasn't there when I put them to bed last night. It has a very fine looking crack in it but nothing is leaking out. Is it still safe to eat?