My main flock of 14 are mixed breeds, Sexlinks, barred rocks, Jersey Giants, a Buff, and White Plymouth, Production red and RIR. They are about 27 weeks old. They started laying in July and have up until recently been giving me on average 11 eggs/day. Last weekend, they all but stopped laying. I'm only getting between 1-3 eggs a day now. I have checked the girls for mites and lice; we rigged a light in the coop so they are getting 15 hours of light. They are getting a 18% all flock food and garden scraps. Add into this I also have 5 Wyandotte hens that are 23 weeks old and haven't seen an egg out of them yet either. The girls have a spacious outside run, and free range when we are home (coyotes got one of my girls so unsupervised free ranging doesn't happen anymore). I'm out of ideas.