I have 5 guineas, 28 chickens, and 6 ducks (in seprate pen right now so they are warmer). None of them have laid an egg since october. I have been feeding them a Nutruna Country Feeds All Flock 18% pellets. They also have a heated water bowl. They get Oyster Shell Calcuim 3 times a week sprinkled on the ground in the 30 ft long by 24 ft wide pen. They have a 6wide by 12 long coop attached to this pen. We have a heat light in there and on 24/7 durning the cold weather. Is there anything I can do to get them to restart laying eggs? any suggests would be help full.