Why Are Eggshells Porous?

If you raise chickens, there are a lot of questions you may wonder about them. One of them is the eggs that they lay. After a close examination of the eggs, you notice that they are not solid. So, why are eggshells porous?

In this article, we will find out why eggshells are porous and other related topics.

Why Are Eggshells Porous?

Eggshells are porous so the egg can breathe.

Eggs are made up of protein, fat, and water. In order to get the nutrients out of an egg, it needs to be at a certain temperature. The egg shell is porous because it allows oxygen to get into the egg so that it can start developing.

As the embryo develops inside the egg, it breaks down the shell. This is why when you crack an egg you can see those little pieces of white in there. The white is actually called albumen and is made up of water, protein, and fat. It also contains B-complex vitamins (which are good for us) and some minerals like iron (which we need).

Can Anything Penetrate An Egg Shell?

In spite of what you might have read, it is possible for small objects to penetrate an egg shell.

The egg shell is made up of calcium carbonate, a substance that is very strong under normal conditions. However, if the egg has been cracked or has a weak spot in its shell, then it will be possible for an object to penetrate it. The only way to prevent this from happening would be to use an artificial shell such as those made from polystyrene or polyethylene.

In addition, if you have ever dropped an egg on the floor, you will notice that it leaves a small crack in the shell which will allow water and bacteria into it. This can cause serious damage to your health if you eat it!

How Do The Pores Affect The Keeping Qualities Of The Egg?

The pores of the shell are very important in determining the keeping qualities of the eggs. There are two types of pores; one is called a micropore and the other one is called a macropore.

The micropores are small pores that are found on the outer surface of the shell. These pores allow air to get inside the egg and this helps in checking further growth of bacteria inside it. When an egg is laid, these micropores close up naturally with time and they do not let external air enter the egg. This helps in keeping your egg fresh for several weeks without refrigeration. When you store your eggs outside a refrigerator, it is recommended that you store them at room temperature as long as possible so that these pores can close properly before you put them back into storage.

Macropores on an egg’s shell are large, open holes that allow air to enter easily into the interior of an egg, which also allows bacteria to grow quickly inside it. If you want to keep your eggs fresh without refrigeration, then you should choose those eggs which have no macropores on their shells because they will stay fresh longer than those with macropores on their shells that need refrigeration if stored longer than 7 days after purchasing them from stores

What Causes Heavy Bloom On Eggs?

Heavy bloom is a condition in birds where their eggs have a thick, white coating on them. It’s not dangerous for the bird and it doesn’t affect your ability to incubate the eggs. Heavy bloom is also known as candling bloom, egg bloom, or sometimes just white bloom.

Heavy bloom can be caused by a variety of things, including:

The type of egg – Some eggs are more prone to heavy bloom than others (e.g., brown eggs). This is because they have different levels of carbon dioxide inside them, which affects how much moisture can get in and out of the shell during incubation.

The humidity level in your incubator – If you keep your humidity too high or too low, it can cause heavy bloom on your eggs. You should ideally keep it between 50% and 70%.

Too much heat – You need to keep your temperature between 99°F and 101°F (37°C) while incubating your eggs so they don’t become dehydrated or overheat, which can cause heavy bloom on them (among other things).

Why Does Bloom Form On Eggs?

There are several reasons why bloom forms on eggs. Some hens lay eggs that have a thick layer of bloom right out of the shell, while others will lay an egg that is completely clean and then start to produce heavily blushed eggs. There are many factors that can cause this change in appearance, including:

Age – As the egg ages, the protective coating will become thicker because there is more air inside the shell. This means that if you find an older egg (which has had more time to age), it may have a thicker layer of bloom than a younger egg would have had at the same stage in its life cycle.

Weather – If it rains or snows while an egg is still inside its nest box, then there may be more moisture around when it starts to hatch than would normally be present during this time period.

How Do You Improve Egg Shell Quality?

There are several things you can do to improve egg shell quality.

The first step is to make sure your chickens are healthy. Poor nutrition and a poor environment can lead to problems with the shell. If your hens have access to fresh greens, insects, and worms, they will be healthier and produce better eggs.

Another important factor is the breed of chicken. Some breeds are known for having stronger shells than others. Rhode Island Reds, for example, have a reputation for producing hardy eggs that are less likely to crack or break during shipping or handling. Other breeds that are known for their strong shells include Leghorns and Langshans.

If you want to increase egg production in your flock, you can add calcium to the diet of your chickens. This will give them more strength when it comes time for them to produce an eggshell. It may also help them build up their bone structure so that they become more sturdy overall and less likely to break when they step on something sharp or hit something hard while walking around outside.

How Do Chicks Get Air Inside Their Egg?

Hens lay eggshells that protect the yolk and albumen inside the shell. The yolk contains nutrients needed to develop into a fully formed chick once it hatches from its shell.

A chick can’t breathe until it breaks through its shell and gets air inside its lungs. The embryo lives off nutrients in the yolk while developing inside its eggshell, but eventually, it needs more nutrients to grow into a full-size bird.

The embryo uses oxygen stored in the yolk as well as carbon dioxide produced during respiration to breathe through membranes in its shell called blood vessels (capillaries). A hole forms in the membrane when it needs more oxygen or carbon dioxide than can be provided by these capillaries alone (a process known as diffusion).


In an eggshell, there’s a porous outer layer known as the external membrane. Its purpose is to keep the embryo safe from contaminants and protects from heat and cold. The most important purpose of all is to allow the chicks inside the egg to breathe.