&   WHERE ARE YOU GUYS KEEPING THESE BIRDS, IN A CAVE? THEY LAY BY THE AMOUNT OF LIGHT THEY RECIEVE , NOT SO MUCH ON WEATHER ALTHOUGH TEMPERATURE DOES AFFECT THEM SOME.  THAT'S WHY YOU CAN GET THEM TO LAY WITH LIGHTS IN DEC. REAL COLD OR REAL HOT MIGHT MAKE THE MALES LAZY SO FERTILITY COULD BE DOWN. COULD THE PROBLEM BE WORMING TOO OFTEN ? THAT WILL MAKE THEM STOP LAYING.   ALSO SOME OF THE POISONS WE USE KILLS FERTILITY (LIKE IVOMEC) COULD YOUR BREEDERS BE GETTING TOO OLD? TRY SOME ONE YEAR OLD HENS NEXT YEAR. INBREEDING YEAR AFTER YEAR WILL ALSO MAKE EGG PRODUCTION DECLINE.  POLISH ARE PROLIFIC LAYERS UNDER THE RIGHT CONDITIONS. I'M SURE YOU'LL HAVE HEARD ALL THIS BEFORE , I'M JUST REMINDING YOU AND ALSO LETTING OTHER FOLKS KNOW.