I have 2 generations of hens: the first are 2 years old and number 17; the second generation are 1 year old and number 22.
Last Fall the 17 started molting and, of course, stopped laying. I am still collecting 22 eggs each day.
I have cleaned their boxes and sprinkled with Seven. I have de-wormed them. They might have just laid all that they will lay in their life time. However, I am still looking for a cause to their stalled egg laying.
The only thing I can see that I find unusual is that some of them have bald heads. Their feathers don't go all the way up to their crowns. Is there a skin condition or pest that will stop their egg laying?