I did a search on this subject, but some of the behaviors is not addressed. My four 26 week old BR's have been laying for about 3 weeks now. They have been pretty regular, laying 6 out of 7 days. Over the last 4 or 5 days 1 of the girls has not layed an egg. She has been going to the nest box and sitting for an hour or so every day, but no egg when we check. (We check frequently as we have another BR whose eggs we have to dispose of due to the waiting period after antibiotic treatment.) Her behaviors are normal, she eats and drinks normally and free ranges with the rest of the flock all day long. She is not lethargic or displaying any signs of illness. I felt her abdomen this morning and didn't feel anything strange (other than I have never squoze a chicken before). I would not be concerned if she didn't visit the nest box every day. Any input would be appreciated.