I was having them drop like flys and last Monday I brought some to WSU to be tested. I thought I had Mareks....Well they would just fall over like the back was broken. They were healthy and fat and from 3 weeks to 6 weeks old. I got the results back and it was lack of vitiman E wow, what a relife! Maby try E in the water for a week? Thats what im doing. I hope its something that can be an easy fix. Good luck!