I have 5 chickens that are about 2 years old. They used to be great layers. But this winter I didn't give them the allowed light for egg production. I didn't give them any additional light other than natural sunlight. I thought the egg production would pick up after the daylight became longer but so far nothing. Right now they are only getting about 13 hours of natural sunlight. My question being will they ever start laying again after the natual sunlight becomes longer? Or have I ruined my chickens forever?