According to my local chicken farmer, the chickens don't lay as many eggs during the cold months, so what does everyone else increase in their diet to make up for the loss of the the perfect food ever created?
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You have to keep the lights on most everywhere in the continental US. You can skip the calendula if you have growing grass still. The eggs (assuming they are pastured) will have more grains and fewer bugs in them.
What farmers will do in the winter is keep the lights on in the coop and feed them dried calendula to color the yolks. The eggs do not nearly have the same nutrient content as during the growing season, and are probably marginally better than eggs from the store. The solution is to eat a bit more liver, more marrow, more deep greens. There is a reason why civilizations all over the world consider eggs a spring food.