I have noticed that weather more than anything else is the determining factor in the number of eggs the hens give up. They must have some kind of built in barameter or something. Probably a genetic hand me down from centuries of evolution. If if is going to get really nasty outside, I have noticed only a few eggs. During the summer months it is when it is going to rain or even a cold evening.
I also noticed the bantams have stopped being thier broody little selves. Also, I have noticed that they are eating a whole lot more than in the summer months. This is why I worm them in the fall about this time. I am going through feed much more often. Sure glad the stuff came down in price !!
One other thing I have noticed. They are in the barn and roosting at least an hour before the sun is down. During the summer months those little turds were out almost to the point of darkness.
Now when i shoosh them to the wire mesh stalls they pretty much give it up right away.