I have four Buff Orpingtons who are two years old and two Easter Eggers who are 20 weeks old. The EEs are laying eggs regularly, but the Orps have stopped completely. It's probably been three or four weeks since I've seen an egg from them. They get plenty of daylight, free-range, and appear to be healthy and happy. They all eat the same layer feed. I've checked the few bushes in the free-range area but no eggs there, either. I also have a rooster who is 25 weeks old. Any suggestions? Seems strange that one breed would stop laying.