I have 6 chickens, 3 red sex links, a production red, barred rock, and an australorp. I have caught the 3 red sex links and production red laying. I think the barred rock is laying too but haven't caught her. We are getting 4 eggs and sometimes a 5th. Anyway we have had an egg with a thin shell that looked like it had a hole pecked in it and it was near the roost and not in the nest. I think it is coming from my australorp. She is very squatty when approached. All the chickens are about 24 weeks. Should I be worried about the australorp not laying and the barred rock only laying sporadically?