My hens started laying poorly this summer, I first blamed the heat and then moulting because most of them are at least partly naked. They don't seem to be growing their feathers back very quickly. This fall I started blaming it on the sudden cool weather and the light waning. In the last two weeks they've dropped from 50% production to as low as one egg. The most I've gathered in the last week was 5 eggs in one day. I've had an artificial light on them now for a week. Most of my hens will be two next spring and last year they laid all winter. At first I had a friend say it sounded like coccidiosis so I treated their water. Some of them have some fairly loose stool, but I've never seen bloody stools. When I mentioned to another friend that some of them had very red irritated skin she suggested mites, so I dusted that night as soon as they roosted. That was last Saturday. I didn't know you could see mites. I went out tonight to get very personal with my most irritated girls, but I could see no crawlies. Maybe I cleared them out the first night? Any ideas what I might be missing? If it was only mites, how long before egg production picks up?