Montana and i recently changed there feed and about 1-2 years plus a new roo in there flockWhere are you located? Weather conditions a possibility. How old are they? Have you checked them for mites/lice? Possible molt? Have you changed feed? Anything change in their daily routine?
Ok thanks and can i ask what kind of rooster is that on your picture cause i have the same kind they look exactly alike.'Tis the season... They are likely starting to molt, and that will cause a decrease in egg production. Add to that the shortening of the days, their age and a change in flock dynamics and there ya have it. You could put a light on a timer in the coop to keep them laying during the winter. Your other option is to wait it out. They'll start up again in the spring.