How Are Chicken Eggs Fertilized?

You may have ever wondered how chicken eggs are fertilized. The male chickens share their sperm with the female hen to produce a fertilized egg. There are several ways that male chickens fertilize their eggs. The male lays on his back and touches the hen’s neck, vent, cloaca, and papilla, the reproductive parts. Before a hen begins laying eggs, the male needs to mate first.

chicken eggs

The egg white surrounds the yolk in the magnum. The isthmus, or membrane, begins the shell-forming process. Then the hen lays the fertilized egg. In the shell gland, the eggs harden and form a shell. Then, the hen mates with the rooster, and the new chick is born. The fertilized egg is not necessarily better for human consumption than the unfertilized egg.

How Are Chicken Eggs Fertilized?

To know whether an egg has been fertilized, check its yolk. Look for a “ring” or a ‘blastoderm’ encircling the yolk. The ring around the yolk means the egg has been fertilized. Never tread on an egg because it can damage the skin or feathers. You can also observe a hen’s wingspread to mate with a rooster.

A fertilized egg is surrounded by an egg-white shaped like a bull’s eye. The rooster’s sperm remains viable for two weeks after mating, which means that the rooster’s spermatozoa will continue to fertilize the eggs. When the rooster has completed mating, a fertilized egg is produced, which may take several days or even weeks.

We all know that an egg doesn’t require a rooster, right? Our chickens will lay one egg every day, with or without the help of the male sex. However, if you want fertile chicken eggs, you’ll need a rooster to look after your hens, which he’ll gladly do regularly. chicken fertilize his eggs in the following steps:

  • Around the chicken, the rooster will dance.
  • Formating, the chicken squats down.
  • The rooster jumps aboard and mates with the chicken.
  • Before the ‘egg white’ or the shell has matured, sperm fertilizes the egg yoke.
  • Before hatching, the viable egg is sat on for 21 days.

What Is The Method Through Which The Rooster Fertilizes The Egg?

The hen will squat down to the ground and spread her wings to support herself once she has decided to accept the rooster. He’ll climb her from behind, catching her head feathers with his beak and trampling her with his feet until he finds a stable location.

“The Cloacal Kiss” is a story about a cloacal kiss. The “cloacal kiss” is what happens afterward. The papilla is a bit elevated protrusion inside his cloaca, and the papilla is where the sperm is passed. The hen must open her cloaca during this “cloacal kiss” so that his sperm can reach the unborn/unlaid eggs in her oviduct. They go about their business as usual once he has passed his sperm. His sperm will fertilize the eggs she had that day and for a few days afterward.

He’ll use his claws to obtain a firm grip on her; this is where most hen injuries occur. Claws or long spurs can rip her sides apart, tearing portions of her skin. You can assist the hen by making sure the roosters’ spurs are short and fitting them up with a hen saddle if he is frequently mating with particular hens.

How Can I Tell If My Chicken Eggs Are Fertile?

On the outside, fertilized eggs appear to be identical to unfertilized eggs. Fertilized eggs likewise look the same on the inside as unfertilized eggs, except for a white bullseye on the yolk of a viable egg. Unfertilized eggs will only have a small white spot or dot on the yolk called the germinal disc, where the sperm enters the yolk.

If you intend to hatch your chicks, begin inspecting the eggs you crack for consumption for the telltale ‘bullseye’ on the yolk. That is unmistakable evidence of a viable egg. If you have a rooster and a small flock of hens, you can bet that all of the eggs laid by your hens will be fertile.

For optimal breeding purposes, breeders frequently pair a rooster with only one hen or up to five or six chickens. Still, I’ve had as many as sixteen hens and with one rooster – and practically every fertile egg I cracked open was fertile. Roosters are highly adept at maneuvering within the barnyard! A single rooster can mate with a dozen or more hens and fertilize all of its eggs.

What Is The Different Between Fertilized and Unfertilized Eggs?

The only difference between fertilized and unfertilized eggs is whether or not a rooster was involved. Hens don’t need a rooster to lay an egg; they do so on their own (nearly every day) based on light patterns. If a rooster mates with a hen, the eggs she produces are fertilized and can carry babies under the correct incubation conditions. Because there is no rooster, the egg has no chance of becoming anything else.

According to a trusted source, there is no risk of ingesting a developing embryo when fertilized eggs are marketed for consumption. According to a trusted source, all eggs sold as food in the United States must be refrigerated, which prevents any development within the shell. In addition, any egg meant for human consumption must be inspected on the inside, which is done by shining a bright light through the shell (a process known as candling), which highlights any anomalies, such as a developing chick. These rules apply whether the eggs are for a huge supermarket chain like Safeway or a farmers’ market. Inconsistent eggs are never sold in stores and are discarded (except one time).

Fertilized and unfertilized eggs are nutritionally equivalent, according to Cobey. Kathy Shea Mormino’s article “Facts & Myths About Fertile Eggs” on her site, The Chicken Chick, also tastes the same. Mormino is an attorney, backyard chicken keeper, advocate, and educator who has been featured in The Wall Street Journal, Associated Press, and on local and national TV, radio, and podcasts.

Is It Safe To Consume Fertilized Chicken Eggs?

Fertilized eggs are safe to consume; some argue they are healthier than unfertilized eggs. However, we have never seen any evidence to support this assertion. (Let’s face it; if the viable egg is fresh and unincubated, you will get a half-cell addition.)

For years, farm families have consumed fertilized chicken eggs, as every farm flock had a rooster for flock security and to continue the flock once the older hens ceased laying. Fertilized eggs taste identical to unfertilized eggs and have the same nutritional value, and only fertilized eggs have a trace of rooster DNA.

If I Do Not Refrigerate The Eggs, Would They Begin To Develop Into Baby Chicks?

You can be confident that any viable eggs you gather and store in the refrigerator will remain dormant. Fertile eggs must be kept at a consistent temperature of 85 degrees or above for many hours to develop and at a temperature approaching 100 degrees for 21 days to hatch into chicks. Even if a broody hen sits on an egg for up to four days, the egg will develop very minimally.

Because the refrigerator‘s chilly temperature prevents the egg from developing, you will not find a young chick inside the egg you crack for breakfast or fertilized eggs left on the counter begin to mature unless your residence is kept exceptionally warm. However, if you are concerned, collect eggs from your chicken coop regularly and refrigerate them immediately upon collection.

Are Chicken Eggs Nutritious?

Chicken eggs are a good source of protein and other nutrients at a reasonable price. Additionally, they are naturally high in cholesterol. However, eggs’ cholesterol does not appear to boost cholesterol levels in the same way that certain other foods, such as those high in trans fats and saturated fats, do. Whole Eggs Are Among the World’s Most Nutritious Foods

Indeed, the nutrients contained within are sufficient to transform one fertilized cell into a complete young chicken. Eggs are packed with vitamins, minerals, high-quality protein, healthy fats, and less well-known compounds.


Traditionally, a rooster mates with a single female chicken and fertilizes one egg. The sperm is preserved in the rooster’s pocket for two weeks after the mate. This means that a productive hen will be able to fertilize 14 eggs from a single mating. So, a fertilized egg is a fertile one! Once the rooster has mated with a hen, the egg will be fertilized. If the rooster hasn’t mated yet, the egg is unfertilized. This means that the egg will not develop an embryo. However, the embryo will be viable if the rooster can mate with the hen. It may take many years for the fertilized egg to reach the stage of development.

Researchers have to mate a rooster and a hen to determine the fertilized egg. The rooster must be present at egg-laying to ensure that the eggs are fertilized and the egg does not have to be fertilized in the rooster’s presence. The hen’s sperm and yolk do not mate, and the rooster and hen must be together during the entire fertilization process.