双语早读｜鸡蛋有红皮、白皮、绿皮，有什么分袂？

鸡蛋有红皮、白皮、绿皮，不同热情的鸡蛋有什么分袂？有东说念主说，红皮鸡蛋比白皮鸡蛋有养分，这是真实吗？为什么鸡蛋壳会有不同热情？来望望大家的诠释。

去超市或农居品商场仔细不雅察成箱的鸡蛋，你可能会珍爱到鸡蛋既有白的，也有褐色的，有手艺以致是绿色或蓝色的。然而变成炒蛋或蛋糕之后，又基本看不出分袂了。那么，这些鸡蛋除了蛋壳热情不相通，还有什么不同呢？

Peruse the egg section of a grocery store or farmers market, and you'll notice cartons of eggs separated into white and brown, sometimes even green or blue eggs. But once they arrive scrambled on a plate, perhaps, or baked into a cake, it's tough to tell the difference. In fact, what is the difference between eggs with shells of different colors?

褐色的鸡蛋不一定更“纯自然”，而白色鸡蛋也不是被漂白了。相悖，它们生来等于那样的，包括蓝绿色的鸡蛋亦然。但不管蛋壳热情如何，它们的内在实质上王人是相通的。那为什么这些鸡蛋王人是母鸡生的，“肤色”却各有不同呢？

Brown eggs are not more "natural," and white eggs have not been decolored with bleach. Both varieties occur completely naturally, as do bluish-green chicken eggs. But really, all chicken eggs are the same on the inside. So what causes different egg colors among the same type of bird?

乔治亚大学家禽学系的贾斯汀·福勒训诫对此作出了阐释： “鸡蛋热情不同，能够有些带有雀斑，是母鸡基因不同导致的。”

Dr. Justin Fowler, a professor in the University of Georgia's poultry science department, shines a light on things. "The different colors, or the presence of spots or speckling, come down to the genetics of the bird," he says.

念念要知说念某只鸡下什么热情的蛋，不错望望它的耳垂是什么热情（没错，东说念主家鸡亦然有耳垂的！）福勒说说念，“白色耳垂的鸡产蛋通常时不会分泌色素，是以下的蛋通常是白色的。”一般来说，耳垂热情较浅的鸡羽毛王人是白色的，下的蛋亦然白色的，而羽毛和耳垂有色的鸡则会下有色的蛋。

Want to know whether a specific chicken will pop out a white egg or a colored egg? Examine the chicken's earlobe. (Surprise, birds have earlobes!) "Breeds with white earlobes will typically be those that do not put extra pigment on the egg shell before laying," says Fowler. And more often than not, chickens with lighter earlobes tend to have white feathers, and thus white eggs, while those with colored feathers and earlobes tend to produce colored eggs.

这些热情是如何来的？这就要从鸡蛋的变成流程提及了。母鸡的卵巢里会起先生长出蛋黄（也等于卵子）。进修的卵子会离开卵巢来到输卵管。在输卵管中，卵子会按顺次经过五个部分，然后才到达体外；其中第四个部分是卵壳腺，蛋壳等于在这里变成的，这个部分影响了鸡蛋的热情。

Where does this color come from? Here's where understanding how an egg comes to be is important. Chicken yolks, or ova, form in the chicken's ovaries. A fully formed ovum will leave the ovary and be deposited into the oviduct. This part of the chicken's reproductive system has five distinct sequential segments which the yolk passes through on its way to the outside world, but it's the fourth one — the shell gland — that affects the color of the egg. This is where the shell forms around the ovum.

福勒称，“总计蛋壳王人是由碳酸钙构成的，碳酸钙是一种白色晶体。是以总计鸡蛋至少起先王人是白色的。有色的蛋壳王人是在经过输卵管时被染了色。不信你不错敲开一个褐色的鸡蛋，望望蛋壳里面的热情，那一定是白色的。”

"The shell of all chicken eggs are made of calcium carbonate, a crystal that is white in color," says Fowler. "So all eggs are, at least at the start, white. Any that we then see that are other colors have had a pigment deposited on them as they were moving through the oviduct, after the white egg shell had been deposited. You can see this if you open up a brown egg and look at the inside of the shell, it'll be white."

决定鸡蛋热情的主要有两种色素。胆绿素会让鸡蛋变成蓝色或绿色，而原卟啉则会把鸡蛋染成红褐色。

Two pigments are responsible for the spectrum of chicken egg color. Shades of greens and blues are caused by the pigment biliverdin, while protoporphyrin is responsible for reddish-brown hues.

其它鸟类的蛋壳热情亦然相通的道理。举例，人所共知，好意思洲知更鸟下的蛋等于蓝色的，而崖海鸦的梨形蛋不仅是蓝色的，通常还带有雀斑或褐色条纹。

The same egg-coloring process holds true for all birds with colorful eggs. American robin (Turdus migratorius) eggs, for instance, are famously blue. The pear-shaped eggs of a common murre (Uria aalge) can sport a blue hue, be speckled or feature brown streaks.

不管是红蛋、白蛋、绿蛋、褐蛋、血斑蛋、肉斑蛋，惟有是清新鸡蛋，煮熟了王人不错宽解食用，养分价值也差未几。

起首：中国日报网英语点津（陈丹妮）

裁剪：董静

审核：王旭泉 韩丰

eggseggand蛋壳鸡蛋声明：该文不雅点仅代表作家本东说念主，搜狐号系信息发布平台，搜狐仅提供信息存储空间劳动。