15 hens, zero eggs in 13 days

your chickens are old and quit laying for the winter.... unless you free range.. and in that case, they've either begun laying somewhere else and hiding them... or somethings getting them.

 

Are they moulting?.....hens usually stop laying during the moult.

You seem to have adequate light.....this shouldn't be the cause.

Do I understand that the majority of hens are just over a year old? Hens of this age usually do have a short 'winter shut down'......but it seems far too early for that. My ladies usually only stop for a short time in darkest December.

Have you excluded worms and parasites? Check a couple near the vent for lice eggs and look for lice generally. If present....treat them. When were they last wormed? If greater than 3 months ago I'd worm them again.

Is their current diet adequate? You mentioned that they did not like their current feed and are no longer free-ranging, so they may be getting deficient. Give them some high protein feed.

I'm sure others will think of other potential culprits.

Good Luck.

 

After a full season of laying, hens need rest. Their bodies need rest as does their reproductive systems. Chickens lay eggs for reproduction, not for food, either for themselves or for us, although through domestication and selective breeding, they produce a lot so that we can "steal" their eggs.

You also created two big changes in their feed and in introducing new chicks. These things can throw them for awhile. Still....

Yours are at the age when they take this break. They'll moult, some more visibly, some more subtly, but when they recover, they'll begin laying again. Usually that means February as they days lengthen enough for their bodies to know that spring is coming again.