My three Barred Rocks will be 24 weeks on Monday and two of the have been laying since just before 20/21 weeks. I have one hold out. She hasn't laid yet and I'm worried because I moved them to layer feed two weeks ago. I'm posting this photo to show the difference between two of them, the size and colour of the combs and such. She's a big girl, however I do believe she is lowest in the pecking order among the three. Does that have anything to do with it? At what point should I be concerned that she isn't laying? Besides right now.