Please help me with my egg laying problem

[red reaper]

Omran, thanks for that article, it would tend to lean towards me feeding them ground corn as to the drop, but another flag raised when I read the diseases,under chronic respiratory disease,it lists gurgling, and I'm suprised no one has said anything about this from my earlier post when I thought a few was gurgling, however they dont have any of the other symptoms under CRD. Under Infectious bronchitis, it lists watery whites, which I have found a couple of those and the sharp drop to nearly nothing in production, however they dont have any of the other symptoms of bronchitis. They look perfectly healthy,but have noticed maybe 4 or 5 gurgling at times. I'll clean the ground corn out tomorrow completely and just put out mash, but should I be doing anything about the gurgling?