What is the reason why hens lay eggs

As we all know, eggs are laid by hens. Both eggs and hens are rich in nutritional value and a large amount of protein, which can replenish energy and nutrition for the human body. There are many ways to eat and cook them, such as: steamed eggs, various kinds of scrambled eggs, egg soup, etc.; hens can also be used to eat chicken or make soup, which is suitable for all ages and is loved by many people. This article explains why hens can lay eggs every day.

Why can hens lay eggs every day? Is every egg you eat a life that is about to take shape? So eating eggs means eating meat? However, in fact, the eggs we buy are generally unfertilized eggs, so what you eat is not actually a future life - but the "menstruation" of the hen. That sounds a bit disgusting.

In nature, it is rare for birds to lay unfertilized eggs. This is because they will find males to mate with in time to fertilize the eggs and ensure the reproduction of the species. In modern laying hen farms where roosters and hens are raised in separate pens, the eggs harvested every day are eggs laid without being fertilized by males. So why do these hens persist in converting egg cells into eggs, even at the cost of wasting nutrients and calcium? In fact, the hen cannot be the master of this matter, because after an egg cell forms an "egg yolk", even the hen itself cannot guarantee whether it can be fertilized. Egg formation: Fertilized or not, just like humans, hens are born with two ovaries, but the one on the right gradually degenerates during growth. The reason for this is generally believed to be to facilitate the laying of larger hard-shelled eggs. Imagine an ovary filled with follicles of varying sizes, growing like a bunch of grapes, containing up to 4,000 primary oocytes, each with the potential to form a yolk. Yolk material slowly deposits around the oocyte, wrapping it up layer by layer, just like a grape slowly becoming plump and juicy. About 2 hours before ovulation, the primary oocyte undergoes a division to produce a polar body and a secondary oocyte. (When the primary oocyte divides, it divides unequally. The larger one is called the secondary oocyte, and the smaller one is called the first polar body.) Then, under the influence of hormones and nerve signals, the follicle smooth muscle contracts and ruptures, and expels the secondary oocyte filled with yolk into the fallopian tube.

At this time, if a rooster has mated with a hen beforehand, the yolk will flow down to the funnel of the oviduct and combine with the ascending rooster sperm to complete the second maturation division, forming a fertilized egg and a second polar body. The fertilized egg continues to move downward and is wrapped by thick and thin egg whites in the enlarged part of the fallopian tube, forming what we call egg white. Next, it leaves the intumescence and enters the isthmus to form the inner and outer eggshell membranes. The next destination is the uterus, where the infiltration of uterine fluid causes the egg to increase in weight and become rounder in shape. Next, calcium is deposited onto the eggshell membrane to form the eggshell, and a thin cuticle protective film is applied to the outside of the eggshell. At this point, a complete egg is finally completed. And unfertilized oocytes will not be destroyed in the fallopian tube. To the downstream "production line", it is an indistinguishable irritant from fertilized eggs and must also be packaged as complete eggs, which is similar to the so-called "pearls produced from diseased clams". Therefore, when your child steals eggs from the refrigerator and stuffs them under his stomach in an attempt to hatch chicks, remember to use this logic to convince him.

However, a very small number of unfertilized eggs may also develop into a little rooster - the key process is that the only remaining sex chromosome Z in the egg cell is replicated into a complete male chromosome ZZ (the female chromosome is ZW), but that is an extremely special parthenogenesis phenomenon.