I have a pen with 6 EEs, 1 BO and 1 BOx. I have another pen with BRs, RIRs, GSL, and BSL. The EE pen has stopped laying almost completely. The other pen, the chickens are laying. Now, I had to treat the EE pen for coccidia almost three weeks ago. They were laying okay, if a bit less than the other pen. I had some bulbs go out in the coop and replaced them. I live up in Montana where, yes, we do get very little light this time of year. I do keep a light on at night. So, my question to you: lack of light? Coccidia treatment? Molting? What? Why have my birds stopped laying in one pen? Added: They were born in February and April.