1. From the appearance of the eggs, the native eggs are slightly smaller and lighter in color, and the fresher ones have a thin white film; Its eggshell is thick and contains high calcium, which is not as brittle as foreign eggshells. However, foreign eggshells are darker in color.

2. If you are not sure, you can open the eggshell after purchase. The golden yolk is a native egg; ; Eggs with light yellow yolk are foreign eggs. After a few more comparisons, you will accumulate experience, and it will be easy to distinguish two different types of eggs in the future; In addition, the yolk of the chicken with pigment in the feed is red and is often sold as soil eggs. Although similar, they can still be distinguished: first, the eggshell of the former is rough; The eggshell of earth eggs is more delicate and hard.

Real earth eggs are really more delicious than any kind of eggs sold in the market. Real earth eggs, even boiled eggs, are delicious.

Although the earth egg is small, the yolk is not smaller than the foreign egg. Foreign eggs are big, and there are a lot of egg whites-a lot of water, which can be seen when frying eggs, and the oil pan rattles.

5. The egg white of the earth egg is clear and sticky, slightly yellow-green, and the yolk is golden. It floats on the egg green and does not sink to the bottom. A toothpick inserted in the middle of the yolk can stand upright. Its eggshell is tough and thick, with high calcium content, not as brittle as other eggshells. Peel a hard-boiled egg and rub it in your hand. Even if the egg is squashed, protein will not crack, and it is still a complete egg.

6. Look at the brightness of the eggshell. If the surface of eggshell is bright, it means that the storage time is long and the surface of fresh eggshell has a strong three-dimensional effect; Pick up the egg and shake it in your ear. If there is noise, it means it is not fresh. Put the egg in a dark place and shine a small flashlight on the larger end of the egg. The smaller the air chamber (that is, the gap inside the egg), the fresher it is.

Nutritional value of mountain eggs; Many elements contained in mountain eggs are essential components for the development of nervous system. For example, lysine and unsaturated fatty acids can nourish brain nerve cells and increase brain activity; Zinc participates in the synthesis of DNA and RNA in the brain, promotes the healthy development of brain cells and enhances memory; Taurine is an inhibitory neurotransmitter and neuromodulator in the central nervous system, which plays an important role in eliminating brain fatigue and enhancing memory.