The formed bird egg consists of the yolk, white, shell and thin shell. The share of protein usually accounts for about 64% of the liquid content of the egg, and the share of yolk - 36%. However, the latter is not found in all eggs.
Eggs without yolk
Chicken eggs without yolk do occur, but not so often. They do not go on sale, so many simply do not know about the existence of such an anomaly in the structure of the egg. It can appear when the yolk falls into the abdominal cavity of the chicken, and a clot of protein at this time is enveloped in a shell. Such eggs can always be recognized by their appearance: they are distinguished by their extremely small size.
This situation is a sign of hormonal disorders in the laying hen. They can be caused by stress, poor housing, as well as unbalanced feeding and overcrowding of birds.
There are situations when the yolk in the egg bursts and mixes evenly with the protein. In this case, the yolk is not visible, but this is not considered a pathology, unlike the first case. Naturally, such eggs also become unsuitable for incubation. However, they can be safely eaten, they will not bring any harm to the body.
Eggs with a few yolks
The most common anomaly is at the other extreme - poly-yolk, which is characterized by the presence of two or more yolks in one shell. There may be three, four or even ten. These eggs may be of normal size or slightly larger than normal eggs. Poly-yolk in itself is not a sign of quality, although some sacredly believe that the more yolk in an egg, the more useful it is. Some producers even specially create certain conditions for laying hens so that they lay eggs with two yolks.
Meanwhile, this pathology also speaks of a hormonal disruption in the bird's body. The nature of poly-yolkness is exactly the same as the birth of "twins-triplets" in humans. It occurs when the body of the laying hen strays from the normal rhythm of egg maturation.
In a healthy bird, a new egg cell begins to mature about half an hour after the previous clutch. In sick layers, this process is disrupted, as a result, two eggs begin to move along the genital tract at the same time, putting on a common shell and protein membrane. Poly-yolk eggs are also unsuitable for incubation.
As a rule, eggs with several yolks are laid by mature or too young layers. In the latter, this usually happens due to the fact that their reproductive cycle has not yet been properly established. The ability of a bird to lay eggs with yolk abnormalities can be inherited.
