Occasionally eat an egg, break the shell and find two yolks inside. We call it "double yellow egg". How is this double yellow egg formed? As we know, the main component of eggshell is calcium carbonate, so the food that hens eat always contains a lot of calcium, especially in the laying period, the demand will be more.

If a hen lays double yellow eggs, it means that its reproductive system is abnormal. When this happens, the ovarian function is often too active, and the mature eggs are constantly discharged to the fallopian tube, which makes it too late for the fallopian tube to wrap the yolk with protein, so the two yolks gradually approach and are finally wrapped in the same eggshell, becoming double yellow eggs.

In fact, there is also a kind of non-yellow egg, which is also produced in an abnormal state. Because the fallopian tube will secrete protein and eggshell from the falling things and wrap it. However, if a hen has parasites in her ovary and accidentally falls into the fallopian tube, or a local blood vessel in the ovary or fallopian tube ruptures and a blood clot falls into the fallopian tube, it will be wrapped by protein and eggshell, forming a yellow-free egg.