In the same way we humans need sunshine to thrive, chickens need it too. UltraViolet rays from the sun provide essential Vitamin D to people animals and plants.Sunshine plays an important roles in the life and health of a chicken.They are programmed to head into their coop to sleep when the sun is going down. Diminishing hours of daylight in autumn and winter signals to a chicken that it's time to start the annual moult and they have a rest period for a few weeks or months without laying eggs.At some times of year yolk colour will not be as vibrant as usual. It is usual for green feed to disappear from paddocks with the heat of summer or the cold of winter. The carotenes in green grass help to produce vibrant, bright yolks. To fool their customers, most egg producers put manufactured colouring additives in their poultry feed to maintain an illusion. We refuse to adulterate the food we give our hens. So always expect variations in yolk colour. Be suspicious if the yolk colour is always the same (even within a one dozen egg pack)
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