hens lay eggs all over the world without a rooster? Chickens belong to birds. Among birds, not only hens can lay eggs all over the world alone, but chickens, ducks, geese, and quails all have this characteristic, all of which are done by humans.
Before the emergence of humans, the ancestors of these poultry could not lay eggs all over the world. Only poultry domesticated by humans have this feature, because eggs can be used as sustainable food for humans, and humans are also a part of the natural environment. In other words, this is the result of the evolution of poultry under natural environmental selection.
How do humans let hens lay eggs all over the world?
A long time ago, someone found that there was no rooster in a chicken pen but they could receive eggs every day, and they did not see the chicks breaking out of their shells. These eggs became food on the principle of not wasting.
The ancients raised chickens for crowing and eating meat. Generally, when chickens grow large enough, they will be slaughtered and served on the table. The emergence of a hen who loves laying eggs breaks this rule, because its owner can get eggs from it every day.
later discovered another thing, the hen and the rooster combined to hatch some offspring and inherited the characteristics of the world's eggs. As a result, the owner took care of these chickens who love to lay eggs, and the number and value of "laying chickens" doubled.
After the spread of the story, every household exchanged other items for "laying hens" with the owners of the chickens. The laying hens that each household exchanged back gave birth to generations of offspring who loved to lay eggs. The original small group has spread to become mainstream chickens in every family.
This is like the evolution of species, except that the evolutionary factor is human beings. For example, before the 19th century, a species of birch moths grew in Manchester, England. Almost all of them were light-colored and lived in light-colored lichens. With the outbreak of the Industrial Revolution, a large amount of soot produced by industry caused the lichen to disappear, and even the bark was smoked dark. The light-colored birch moth disappeared in large numbers because there was no light-colored lichen as a cover. In the mid-20th century, the number of birch moths recovered, the difference is that they all evolved into a dark color, clinging to dark bark and rocks. The birch moth has also evolved to adapt to the environment "under the action" of humans.
The hen does not have a rooster, why can she lay eggs?
birds are male and female. The chicks break out of their shells and need to cooperate with the rooster. So why can a hen lay eggs without a rooster?
Eggs are also called eggs. Chickens can be hatched only if they have a complete cell structure and genes. Genes are also called the code of life. They are like instructions for life growth. They can guide organisms to replicate various proteins to form various tissues and organs required by organisms. Different individuals will be produced under the guidance of different genes. Therefore, genes are also the "identity of organisms". certificate".
For male and female creatures, half of the life code comes from the mother and half from the father. Although a hen will lay eggs when there is no rooster, such an egg lacks half of the life code, and the lack of a complete manual means that a chick cannot be hatched.
In fact, human females also ovulate. The difference is that human eggs can only be activated when they combine with the other half of the male's genes to grow, replicate, and divide. A woman can discharge about 400 mature egg cells in her lifetime, and they can only survive for 48 hours after they appear. Only during this period can they obtain the other half of the genes to form a pluripotent cell for growth and development. Most of the unsuccessful eggs will flow down the toilet into the sewer or be thrown into the trash can along with "little clouds".
The accidental mutation of the hen made the unpaired egg cells have a certain growth ability, and they were wrapped in egg white and calcium carbonate eggshells and discharged. This mutation is just needed by humans, so it has become the survival advantage of the hen, and it has reproduced to this day.
hen leanThe eggs laid by yourself means that there is actually only one cell in the egg, and there is no division. Growth is just a process in which the yolk of the egg becomes larger and protein increases, while the egg white is only the nutrients provided for cell development.
How to distinguish eggs?
If we knock on the egg and find that there are red "bloodshots", small black spots, or white floccules in the yolk, it means that the egg has been "cooperated". If there is nothing on the yolk, there is also in the egg white. The absence of any impurities means that this is the hen's own product.
Without damaging the shell of the egg, we can also use light to probe the situation inside the egg to identify whether the egg can hatch a chick.
Some people may have heard of hairy eggs, and they must be co-operated by cock. The chicken farm first identifies hatchable eggs, and then uses the incubator to hatch the eggs. Totipotent cells continue to absorb egg whites, replicate and divide, and absorb most of the egg whites in about 15-20 days. When the chicks are about to take shape, turn off the constant temperature to terminate the incubation of the eggs. This incompletely hatched egg is a hairy egg.
summary
The world's eggs in the
hens are due to genetic mutations that cause the egg cells to grow, and the egg white and calcium carbonate shells are excreted. Due to human demand for eggs, the frequency of this variant gene is constantly increasing, and eventually hens laying eggs can be seen everywhere.
The egg cells without roosters lack half of the genes and are not totipotent. The cells cannot replicate and divide, and chicks are hatched.
