Can Yolk color be manipulated?
Yes. Yolks can be changed to different colors without affecting the nutritional quality of the egg by manipulating the feed given to the hens.
- Golden orange yolk
While this a sign that the hen had access to fresh pasture with natural food like insects, plants, etc., it can also be manipulated by adding synthetic colours or natural pigments in hen’s feed without actually enhancing the egg’s nutrition.
- White yolk
In parts of USA, UK, northern Europe, where wheat is fed instead of corn the yellow pigment color is lost naturally producing pale or white egg yolks.
- Red Yolks
In China, Taiwan and Japan, the colour red is associated with luck and vitality. The red color in the yolk is developed by using paprika, chilli or other carotenoid-rich ingredients.
- Green Yolk
In 2020, a man in Kerala was able to produce green-coloured yolks. experts at the Kerala Veterinary and Animal Sciences University later confirmed it was simply through feed manipulation and nothing special!!
Check out various references that show how feed affects the egg yolk color with little to no effect on nutrition:
|
Finding |
Reference |
Link |
|
Egg yolk colour comes from carotenoids in the hen’s food. |
Nys & Guyot, “Egg formation and chemistry,” 2011 |
1 |
|
Feeding marigold flower meal and spinach significantly increased yolk colour scores. |
Sünder et al., 2022, Food Chemistry |
2 |
|
Marigold concentrates and paprika oleoresin, separately or together, were shown to greatly enhance egg yolk pigmentation. |
Fletcher, 1983, Poultry Science |
3 |
|
Paprika and paprika plus marigold flower extract increased yolk colour scores; |
Lokaewmanee et al., Italian Journal of Animal Science, 2010 |
4 |
|
A darker yolk usually reflects hen diet, feed composition, plant pigments, age, and health, but “the color of the yolk will not always indicate” higher nutrition |
University of Georgia / Dietetics Director, 2025 |
5 |
|
Consumers often associate darker yellow/orange yolks with higher value, while yolk colour itself does not significantly determine the egg’s nutritional value. |
Matache et al., 2024, Agriculture |
6 |