Not an actual disease but…

[LaFemmeKatia]

I have a flock of five lavender Ameraucana hens who are not quite two years old. For a year they all layed beautiful blue eggs.
About two almost three months ago they all stopped laying. So late fall, early winter.
Egg production went down a bit in my other (assorted breed) eleven hens as well. But they still layed a few eggs and now they are back up to par.
One Ameraucana layed a bright blue egg the other day but that’s it.
They are all on a 20% protein feed, and they have ample sources of oyster shell calcium, which they do consume.
I do give treats - scratch grains, alfalfa, and fresh collard and kale greens, various scrap vegetables chopped up.
Is this just normal? And will they lay eggs again. Am I doing something wrong?
As I said, the other hens are laying regularly.

 

[nuthatched]

They're just on winter break, they'll start in a month or so.

 

[BigBlueHen53]

Yes, they may need more daylight hours but it does seem they'd be laying since the others are. (Are the "others" younger? That might account for it - often pullets will lay through their first winter while 2 yo and older will not.) You'll probably see eggs soon. You might cut back on the treats and snacks if you're being very generous, those should not exceed about 10% of their diet. More than that interferes with the amount of good solid nutrition they get from their commercial feed - think "meat and potatoes," while the treats are more like "cake and ice cream."