I raise chickens in Fairbanks Alaska.Mostly 'red sex mix or Rhode-Island Reds'...this winter has been a cold one and the chickens are looking a little worse for wear having been cooped up for so long.BUT we have had great eggs this winter because of a cpl reasons. Neat trick is to cook them a meal - it can be rice (which they love) ,oats or oatmeal,any grain soaked in water and/or even a pan of scratch. If you add a cpl table spoons of Cayenne pepper to the mix while cooking -(they totaly ignore it when eating) it is not something they can ignore when it is pooped out--BUT !! it tends to warm thier behind and makes them much more productive with the egg laying {call it a chicken aphrodisiac if you will} It works like a charm... another benefit of this is that cayenne pepper helps to control illnesses and diseases in your coop.
It is also very important to not make any drastic changes to thier enviroment while they are in the coop... stress puts an immediate halt to the egg laying as will too much darkness also.3 dozen+ eggs a day from 43 hens and 1 rooster for most of the winter thus far... Jay