I have 5 "rare breeds" including Golden Cuckoo Marans, Blue Splash Marans, Barnvelder, Cream Legbar, and Jubilee Orpington. They all layed last year until fall when they molted, recovered their feathers normally, and layed very sporadically in late winter with added light in the coop. For the last several months only one (Barnvelder) has been laying a few each week. On the recommendation of the hatchery, I changed to a high protein feed three weeks ago with no change so far. There is no evidence they are eating the eggs, no predators have been getting in the coop (just a few field mice), no signs of illness. I've run out of ideas! Do you have experience with these breeds?