I'm not sure what's going on. They are different breeds - Rhode Island, Americauna, Bard Rock, Ostrolope, Wyandotte and a Leghorn and they are about 1-1/2 years old - the Wyandotte and Leghorn are only about 1 year. There is molting going on - feathers all over the coop. They are fed a mix of pellets, scratch, oystershell and grit and table scraps. It seems weird they would all stop at the same time. I noticed a reduction in the number of eggs per day as the weather started cooling down (California Bay Area) but I didn't think they would stop altogether. Any ideas??