This is my first year with chickens, so I'm not sure what's going on. I have about a dozen gals, only two of which are old enough to lay. The two layers are Barred Rocks. I bought them (as adults) a couple months ago out of impatient fury, because my raised-from-peeps gals are still too young to lay. The rocks have been laying steadily 3-4 eggs a week each, until about last week when they just stopped entirely. The weather is beginning to change here, so maybe that is it. No one in the flock is sick, no one is wormy, and there is no fighting...so I don't think it's stress. Any ideas?