What are the causes of white egg shells

Eggs are a staple food item consumed by people all around the world. They are a versatile ingredient that can be used in numerous dishes. When it comes to eggs, most individuals are familiar with the standard image of a white egg shell. However, have you ever wondered what causes the eggshells to be white? In this article, we will explore the various factors that contribute to the white color of eggshells.

Firstly, it is important to understand that eggshells are primarily composed of calcium carbonate. The color of the eggshell is determined by the breed or type of chicken that laid the egg. Different breeds of chickens produce eggs with various shell colors, ranging from white to brown to even blue or green. However, in this article, we will focus on the causes of white eggshells.

One main reason for white eggshells is genetic. Certain breeds of chickens have been selectively bred over generations to produce white-shelled eggs. The goal of this breeding process is usually to maximize egg production rather than shell color. Leghorns, for example, are a popular breed known for producing a high number of eggs, and their eggs have white shells.

Another cause of white eggshells is the absence of specific pigments. Brown eggshells, for instance, get their color from a pigment known as protoporphyrin, which is present in the shell gland of the hen. The protoporphyrin binds with calcium carbonate during the egg formation process, resulting in the brown color. However, in the case of white eggshells, these pigments are either absent or present in very minimal amounts.

Moreover, diet can affect the color of eggshells. Hens that are fed a particular diet may produce eggs with lighter or darker shells. For example, chickens that are fed diets rich in pigments such as corn, marigold petals, or alfalfa can have eggs with darker yolks and sometimes even slightly tinted shells. On the other hand, hens that consume a diet lacking these pigments may produce eggs with lighter or pure white shells.

Furthermore, age plays a role in the color of eggshells. As hens age, their egg production declines, and the quality of their shell may be affected as well. Older hens tend to produce eggs with thinner shells and a paler color. This can be one contributing factor to the white color of some eggshells.

Lastly, temperature can impact the color of eggshells. When hens are kept in warmer climates or during periods of hot weather, the high temperatures can cause changes in the shell formation process. This can result in lighter-colored shells or even a temporary loss of pigmentation. Oftentimes, the color returns to normal once the temperature becomes more moderate.

In conclusion, several factors contribute to the white color of eggshells. These include genetic traits, the absence of specific pigments, diet, age, and temperature. While some chicken breeds are bred specifically to produce white-shelled eggs, other factors such as diet and temperature can also influence the shell color of eggs. Understanding these causes can provide fascinating insights into the diverse range of eggshell colors we find in the culinary world.