Over the last two years, I've had three chickens come down with some odd malady where first they have pour egg quality such as just membranes instead of shells and then it progresses to cessation of laying eggs. These chickens are typically between the ages of 9 months-2 years. When they first come down with it, I observed that they become very lethargic, hardly eating and standing still in one spot for hours at a time. I ended up putting down the first three chickens that came down with it, and now, as of yesterday, another one stopped laying eggs and is standing still staring off into space vacantly. This chicken is only nine months old and I REALLY don't want to put her down. I would like to know if there is a way to diagnose and cure this illness. I did take the first chicken to come down with it to a local vet but despite all of his efforts, she never started laying again and I did put her down. Any ideas?