I figured out why my girls weren't all laying.
We have MITES!!! And not a small amount of mites, enough that one of my younger hens got anemia and had to be nursed back to standing. She was too anemic to even open her eyes.
I'm not asking for mite-treatment (we have already gone with permethrin on the worst mite carriers, cleaned and sprayed the coop) and I'm going to put wood-ash in for long-term prevention.
But WHAT is the best source of iron for chickens? Mine free range half the day on our dusty weedy property, as well as eat layer crumbles.
I am, however, going to throw out there that if your hens aren't laying, and are molting at innappropriate times, check ALL of their vents for mites!
Fingers crossed that the problem is treated and they all get back to healthy. I was getting very worried about the bald throats and the lack of eggs.