Skip to Content

Why Are Eggs White ? Here’s What Determines Their color

Sharing is caring!

Eggs are recognizable in any culture, in any film, drawing, animation, anything. Whether they’re cracked or whole, we all know what an egg looks like. But in truth, all over the world people have different views of what color an egg shell should be, and which is best. Yes, people really get upset over these things.

You may have noticed there are different egg colors, from white to brown and everything in between, including a few shades of blue. Yes we’re still talking about chicken here.

So why are some eggs white ? Why aren’t all of them white ? Is it a mutation ? Are brown eggs painted ? Are white eggs bleached ? What’s the original egg color ? Do white chicken lay white eggs ? Do brown cows make chocolate milk ? Someone please explain all of this. No worries, that’s just what we’re goin got do.

eggs white

Why are eggs white ?

Eggs are white because they come from a type of laying chicken breed that has been bred to only lay white eggs. The original chicken egg color is a shade of creamy-brown with spots all over it, to better blend and camouflage in the wild. Red hens, the most common, still have that part of their genetic programming intact.

They will almost always lay brown eggs. White eggs were initially a mutation, until several breeds were developed to lay eggs that are only white.

People used to think the feather colors dictate the egg color

The hen’s feather color is somewhat corelated with the egg color, but is not a 100% indicator. Meaning that white hens will usually lay white eggs, while red hens will usually lay brown eggs.

But what about black hens ? Spotted ones ? Have you ever seen black eggs ? And who lays the bluish eggs, no one’s ever seen a blue hen ?

Read also: Why Are Eggs In The Dairy Section ? 

This theory has been debunked a long time ago, simply because not al white hens lay only white eggs. They may also lay cream colored ones, or spotted eggs.

Some spotted hens may lay the occasional white egg as well. So that theory’s out the window.

There is a chicken earlobe theory

A more commonly accepted theory is that the color of a hen’s earlobe will tell you what kind of egg it lays. And it’s partly true, to some extent. It’s more of a correlation thing than a causation.

If you’re wondering what a chicken earlobe is, it’s a fleshy part right under the chicken’s ear, close to the eyes. Its earlobe looks different than our, but it does the same job. Brown egg hens tend to have red earlobes, while white egg hens tend to have white ear lobes.

Until they don’t, because this theory is as shaky as the feather one. Again, you can have red earlobe chicken with the occasional white egg, and the other way around.

In the end it’s all down to chicken breed

There is no true, 100% way to guess what kind of egg a hen will lay just by looking at it. This is because the true indicator of an egg color is the hen’s breed, which has been bred and selected over generations to only produce this or that egg.

chicken breed

And many breeds are similar, so telling them apart is difficult unless you’re a chicken enthusiast.

The various chicken breeds that are meant to lay only white eggs have a part of their genetics changed. No one is sure where and how the first white egg came about, but the result is that some chicken breeds have been developed to only lay white eggs.

For example:

  • the Andalusian, grey marbled hens, have white eggs.
  • the Araucana, light brown, produce light blue eggs.
  • the Leghorns can be white or brown feathered, but will always lay a white egg
  • the Ancona is a spotted black and white hen with white eggs
  • the Delaware, white feathers with a few black ones near the neck and tail, produce brown eggs
  • the Minorca, a completely black hen, lays white eggs

And so on. The color of the egg shell is the last to form, as the entire eggs production goes. So the hens that lay white eggs simply skip the pigment step, and lay an egg that is technically colorless.

Brown eggs were meant as camouflage

The original egg, back when chicken were still wild animals, was a very uninteresting shade of brown with a few spots here and there. This led to some really good camouflage and chicken hunters couldn’t easily find the eggs.

This led to brown eggs being the default color pattern, since it was the one laid by the survivors. As chicken became domestic animals, they were safer and humans made sure they always had everything they needed. So when a random white egg would appear, it was never discarded.

This led to more and more hens having this mutation, some were bred for that specific gene, until humanity had a few white-egg-laying hens that could form the basis for an entire breed.

There is no nutritional difference in white and brown eggs

Realistically, there is no nutritional difference between brown and white eggs. The only difference between them is when the shell forms, and this does not impact the quality of the egg yolk and white all that much.

You may see brown eggs being slightly more expensive than white eggs, for a good reason. Brown eggs require more from the hen, in terms of vitamins and minerals. White egg shells are simpler to make, from that point of view. So, the brown-egg-laying hens simply need better or more food.

Egg white whitens as it cooks

If you question was regarding why egg whites are white, it’s simply because the protein turns opaque as it cooks. Egg white, or albumen, is transparent when raw and white then fully cooked. This happens for all eggs from any species, everywhere.

It’s the same type of protein that meat may release when it’s cooked, that foam on the top. It’s simply liquid protein, and it’s cooking.

Sharing is caring!