Eggs are the most common food, small ones, and contain a lot of nutrients. The amino acids and proportions of eggs are very close to the human body and are the best source of protein. When buying eggs, we will find that there are many colors of eggs, such as white, yellow, pink, and red. Because red shell eggs are generally more expensive than white shell eggs, people always think of the nutrition of red shell eggs. The value is higher than the white shell egg, but is it true? What is the difference between red and white shell eggs?
Why is the egg shell color different?
The color of the egg mainly comes from the pigment secreted on the surface of the hen's reproductive system. Whether the egg is red or white, depends mainly on the breed of the hen, and there is no necessary connection between the feeding method and the choice of feed.
In fact, the color of the eggshell is completely determined by genetics. In some chicken blood, hemoglobin can be metabolized to produce egg-shell porphyrin, which makes the eggshell light red. Some chickens cannot produce egg-shell porphyrin, so the eggshell is white. .
Red-shelled eggs are generally produced by grass hens, which are characterized by thin eggshells and large yolks, which are orange-yellow. The white shell egg is born of white chicken, which is characterized by thin eggshell, small egg yolk and light yellow color.
Generally speaking, the white-shelled hens and the red-shelled hens are crossed, and the eggs that come out are powder shells, which can be achieved in both free-range and cage culture.
The difference between red shell eggs and white shell eggs
Whether it is white or reddish eggs, the main nutrients are protein, fat, vitamins and cholesterol. Food experts have shown that although there are differences in different egg types on some trace elements, this difference is extremely small, and there is no need to emphasize the difference in color in the process of buying eggs.
Science and technology workers have used the same feed to feed grass hens and white hens living under the same conditions. Then, the components of the red and white shell eggs were analyzed. As a result, from the analysis of the two main nutrients of eggs, protein and fat, the content of red shell eggs was 14.4% and 11.8%, and that of white shell eggs was 15.0% and 9.9%. The difference was small, other nutrition The ingredients are also basically similar.
How to choose eggs?
1. Smell the smell. Use your mouth to gently sip a hot breath on the eggshell, then sniff the smell with your nose. The good quality egg has a slight lime smell.
2, look. The eggshell of the fresh egg is rough and has a creamy powder on it; the eggshell is smooth and bright; the eggshell that is rainy or damp and mildew has gray spots; the shell of the stinky egg is black, and some are oily.
3. Put the egg between the two fingers and shake it around your ear. The fresh egg sound is real, the eggshell is attached, there is no swaying feeling, the stinky egg has a squeaking sound, and the empty one has a hollow sound. The cracked egg is squeaky.
4. Measure buoyancy. Put the bought eggs into the water, the fresh eggs will sink to the bottom of the water, and the long-term eggs will float.
Usually when we buy eggs, we will keep a lot of them in our homes. However, if the storage is not good, the eggs will deteriorate, so the bought eggs should be stored like this.
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