The so-called "earth eggs" in our daily life mainly refer to the eggs laid by free-range farmers. "Foreign eggs" refers to eggs laid by chickens with feed samples in chicken farms or degraded professional households.
Some people think that the nutritional value of native eggs is higher, mainly because native chickens grow in the natural environment and eat natural foods completely. In this way, the eggs produced must be natural foods and more nutritious. Many people would rather spend more money on earth eggs, especially for the elderly, pregnant women and children. In fact, in the real sense, earth eggs should be completely free-range, without feed, and completely feed on insects, vegetables and weeds, but in real life, such real "earth eggs" are really rare or even absent. The so-called "earth eggs" sold in the market with small baskets may not really be completely free-range earth eggs.
In contrast, foreign eggs are produced by chickens that have been specially selected, kept in captivity and eaten with special proportions. However, this kind of eggs, because the chickens themselves have little activity, produce relatively large eggs, but the yolk is slightly smaller than the native eggs. In fact, eggs raised in a unified way may not be worse than native eggs. If the feed ratio is reasonable, they can produce very high-quality eggs just like babies drinking formula milk powder.
From this point of view, there is not much difference in nutrition between native eggs and foreign eggs. What is more important is to ensure the safety and hygiene of products. In addition to raising eggs and native eggs, it is not recommended that you judge the nutritional value of eggs by the color of egg skins. The color of egg skins is completely determined by genetics, so it is not necessary to pay attention to the color of egg skins. When choosing eggs, the freshness of eggs and the reliability of sources are the most important.