Hi everyone, I don't post often, and my last post was on this. I have a Plymouth Rock chicken, and she's at least 4.5 years old. She could be a lot older, as I got her as a rescue, and she was already laying. The problem with her is that she's sitting often and not laying eggs. She may have arthritis, as she's really big. She lays about two big brown eggs every month. She's free range. I just started adding more ground oyster shell to her food. Has anyone else had luck in increasing egg laying with chickens this age? Thanks.