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张大夫:我一直听人说,土鸡在自然环境中生长,吃的也都是天然食物,产出的鸡蛋品质自然会好一些;而一般养鸡场生产的鸡蛋,因采用了专门的产蛋鸡种和人工饲料,其营养价值不如土鸡蛋,因此,即使价钱贵出许多,一些老年人还是愿意购买土鸡蛋。我想知道散养鸡蛋和圈养鸡蛋到底有什么区别,真的是土鸡蛋的营养价值更高吗?
Dr. Zhang: I have always heard people say that native chickens grow in their natural environment and eat all natural foods. The quality of the eggs they produce will naturally be better. Eggs produced in general chickens will be used for special production Laying hens and artificial diet, its nutritional value is less than native eggs, so even if the price is much higher, some older people are still willing to buy earth eggs. I want to know the difference between free-range eggs and captive eggs in the end, is really higher nutritional value of soil eggs do?