My one and two year old hens egg laying has been very low for the past 2 months, which seems odd since last year they laid heavily till November. Anyway, out of the 25 hens 9 of them have had the feathers just before the tail missing since about July which I thought was early for the molt, I'm wondering if it could be something else. I'm thinking it could be mites, if so, what can I give them to get rid of them? Getting 4 to 6 eggs a day from that many hens doesn't seem right, at least this time year. Help!!