Any medical reasons why my hens stopped laying?

[RAREROO]

Hi

I have 25 16-month old hens that had started their molt and where laying fine until a cold front came through about 2 weeks ago, and now they have nearly quit laying. They are now at the point in their molt where their feathers are started to come back in and I have had a light on for them at night. I cannot recall ever having alll of my hens stop laying all at once like this when the cold weather hits and bargain said I should put a post here in this section to see if their may be a medical reason

There are no visible illnesses of maladies that I can tell, all have good weight and seem to be normal. The only new birds to my farm are a young pair of silkies that looked healthy when I bought them and still do and I have them with 3 other silkies, one is a hen that just started laying again since her last brood and she has only skipped one day since she started laying a little over a week ago, so they must not have infected her and she's in the pen with them. And that hen that's laying is not molting either. I also have 2 EE pullets that just started laying and they are still laying nearly everyday. So it's just that one age group of hens that have nearly stopped laying and the eggs they do lay are either smaller than usual, of oblonged and slightly malformed, with I 'm thinking may be another characteric of molting since I have found that some hens tend to revert back to pullets after molting, if you get my meanin. lol

So what do you all think?

 

[Year of the Rooster]

Some may still be finishing their molt or it's the lack of daylight hours. I haven't been getting many eggs either, but i'm not too worried. It's just that time of year.

 

[RAREROO]

Yeah that's what I'm thinkinga and hopeing, I had a post in the Egglaying section and most everyone said theirs are doing the same thing of it's just that time of year, but bargain is a Georgia Girl like me, well I'm a Georgia Boy, but anyway, lol, I PMed her to see if hers were still laying b/c she should have the same weather I have and she said hers were still laying and didn't know what else to tell me so she told me to put a post here and see what I get.

 

[roostercruiser]

Up until about 2 weeks ago mine had pretty much stopped laying. I still have less than 50% of mine laying but they have been molting at different times and this time of year is just a bad time for chickens to be laying.