If you store eggs from hens fed paprika at room temperature for three weeks, their yolks lose color and important nutrients faster than if you keep them in the fridge.

Giving older laying hens paprika extract in their food makes their egg yolks more colorful, especially in Rhode Island Reds — they respond more than Silky Fowl hens when given a higher dose.

Silky Fowl chickens put more eye-healthy nutrients into their egg yolks than Rhode Island Reds when they eat certain colorful plant supplements — it’s in their genes!

Giving certain plant and bacterial supplements to two types of chickens—Rhode Island Reds and Silkies—makes their egg yolks richer in colorful nutrients called carotenoids after a month, and Silkies seem to absorb more of these nutrients than the other chickens.

Adding a type of algae to chicken feed makes egg yolks more orange-red, which people still find tasty and acceptable.