Why can spots on quail eggs be washed away?
Truth: Does the eggshell fade? This is to say from 1944, when a scholar named Steggerda wiped a brown shell egg of "Rhodo Red Hen" and found that its pigment could be wiped off. The harder he rubbed, the worse he fell off, and in the end he wiped them all into a white shell except for those very smooth eggs.
Eggshell markings themselves are "stained"
The formation of egg shells originates from the deposition of calcium carbonate in the uterus. Small calcium deposits first appear on the inner egg shell membrane that is coated with egg white yolk, and then gradually accumulates into a complete egg shell. In addition to the common white eggshells, the uterine epithelium of different birds can also secrete pigments such as leporphyrin to form a uniform blue, green, and brown eggshell background color. The spots on the surface of the egg shell are the deposition of pigments secreted by the fallopian tube wall on calcium carbonate. When the egg slowly descends along the fallopian tube, the pigment attaches to the egg shell to form spots; if the egg rotates inside the fallopian tube, the pigment will drag stripes on the surface of the egg.
Path formed by eggs
Therefore, the metaphor of "streaking" is equivalent to a birthmark on a person's skin, so it is impossible to wash it off. Birthmarks are the product of abnormal skin pigments or blood vessels, and they are integrated with the skin; these spots are not present when the egg shell is formed, but they are attached to it later. This streaking is like putting a layer of camouflage clothes on the eggs to better hide in the surrounding environment to avoid the eyes of natural enemies or predators. Some birds like to lay eggs in the nests of other birds, and they can even imitate the shell pattern of the invaders . Some British scholars believe that porphyrin, the main component of streaks, has the effect of strengthening egg shells .
In addition to the genetic control of eggshell color and markings, it is also closely related to the physiological condition of the female. For example, the content of the coloring substances in the feed, the mother being frightened to produce "stress", suffering from diseases that cause the fallopian tube coloring function to be impaired, and the use of a certain chemical to interfere with the formation of porphyrins will all affect the egg's background color and markings. If the egg shell's markings are easy to wash off, the pigment and calcium carbonate and the egg shell membrane are not sufficiently adhered. The reason may be that the egg is "fresh" as the experts suspect, or it may be due to the lack of some mineral elements or vitamins in the quail feed for eggs. In the follow-up report, the reporter also found that quail eggs purchased elsewhere would fade after the same treatment.
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