The created egg of a bird consists of a yolk, protein, a shell and a thin cover. About 64% of liquid contents of egg, and on a yolk share - 36% usually fall to the share of protein. However the last is not in all eggs.
Yolkless eggs
Eggs without yolk really meet, but isn't so frequent. They don't go on sale therefore many just don't know about existence of similar anomaly in the structure of egg. It can appear when the yolk drops out in an abdominal cavity of chicken, and the protein clot is enveloped by a shell at this time. Such eggs can always be recognized by appearance: they are distinguished by extremely small size.
The similar situation is sign of hormonal violations at a layer. They can be caused by stresses, bad keeping and also unbalanced feeding and big density of birds.
There are situations when the yolk in egg bursts and evenly mixes up with protein. The yolk in this case isn't visible, but it isn't considered pathology, unlike the first case. Naturally, similar eggs for an incubation become unsuitable too. However they can be eaten bravely, they won't do any harm to an organism.
Eggs with several yolks
The most frequent anomaly is other extreme - a mnogozheltkovost of which existence in one shell of two and more yolks is characteristic. Them can be three, four and even ten. Such eggs can have the normal size or to be a little larger than usual. The Mnogozheltkovost in itself isn't sign of quality though some sacredly believe that than more yolk in egg, it is more useful to those. Certain producers even specially create certain conditions for layers that they laid eggs with two yolks. Meanwhile, this pathology speaks about hormonal failure in an organism of a bird too. The mnogozheltkovost nature just the same, as birth of "twins triplets" at people. There is it when the organism of a layer loses a normal rhythm of maturing of ova. At a healthy bird the new ovum begins to ripen approximately half an hour later after the previous laying. At sick layers this process is broken, as a result two ova begin in to move ahead at one time on a genital tract, dressing the general shell and a fibrous casing. For an incubation multiyolk eggs are also unsuitable. As a rule, eggs with several yolks are laid by mature or too young layers. At the last it occurs usually because their reproductive cycle still wasn't established by sense. The ability of a bird to lay eggs with anomalies of a yolk can be descended.