Generally speaking, double yellow eggs are slightly larger than ordinary eggs. The reason for their formation is that two eggs mature at the same time and are brought into the fallopian tube together, where they are wrapped by protein, eggshell and other substances in turn, thus forming double yellow eggs. That is to say, double yellow eggs only have two yolks, and protein and other substances only have 1 serving. If double yellow eggs are fertilized, two chicks can be hatched theoretically.
However, we know that the nutrients in eggs are limited. Although two chicks can be hatched in theory, it is rare to see two chicks hatched at the same time. Most chicks with double yellow eggs died from about 18 to 15 days after hatching. Even if two chicks can be hatched, most of them do not grow well because of malnutrition, and even if they can be born smoothly, they often don't live long.
Reasons for the formation of double yellow eggs
1, the effect of hormone level
Hens are regulated by hormones when laying eggs. Generally speaking, after the hormone gives the instruction of "laying eggs", the hen will discharge an egg. If the hormone is unstable and the wrong instructions are given, the hen will ovulate abnormally and form double yellow eggs.
2. Genetic factors.
Different breeds of chickens have different probability of laying double yellow eggs, which is influenced by certain genetic factors. In Japan, the double yellow egg is a symbol of centuries-old harmony, which is deeply loved by the people and has considerable economic benefits. In a livestock farm in the northern part of life's core monuments Island, hens that often lay double yellow eggs were selected for mating, and a hen that can lay double yellow eggs continuously for 20-33 weeks was bred.
3. Other human factors
In addition to the above two factors, in the feeding process, if overfeeding leads to overnutrition of hens, which leads to disorder of hormone secretion, it is also easy to produce double yellow eggs.