For the last 9 months my chickens have been dying and I don't know why. A neighbor of mine is having the same problem. She took hers to the vet and they charged her $280.00 and told her they didn't know what was wrong with them. We have both been researching the problem and have tried everything. I have removed the top two inches of dirt from their pens and put all new bedding in their boxes and changed their diets. Put lime down, de-wormed them. Add minerals to their water. Went to my local veggie farm and got fresh veges for them.They don't show any symptoms until they lay down and then they usually die with in 1-3 day. I had my husband build me a hen hospital were I was hand feeding and watering them to see if it would help but they are still dying. The only physical sign I can see is their breast bones are so skinny. I even went so far as to cut one open to see if there was something I could see was wrong but found no worms or food in their little throats, or no egg stuck. It breaks my heart to watch them die but I don't know what else to do. I did read on here about having lab testing done. I have one sick right know if she dies I'm going to try them and see if they can figure out what is wrong. I am open to any suggestions.....