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.

乔治亚大学家禽学系的贾斯汀·福勒教授对此作出了阐释：“鸡蛋颜色不同，或者有些带有斑点，是母鸡基因不同导致的。”

"Leghorn chickens (which make up most of the commercial egg industry in the US) lay white eggs, while Orphingtons or Plymouth Rocks will lay brown eggs," explains Fowler. "The Ameraucana breed has a pigment that is able to permeate the whole egg shell and make blue-colored eggs that are colored on both the inside and outside of the shell."

“来亨鸡是美国最主要的商品蛋鸡，它们会下白色的蛋；奥尔平顿鸡和洛克鸡下的蛋则是褐色的；而阿美饶卡纳鸡身上会产生一种色素，能够渗透到整个蛋壳里，让蛋壳里里外外都变成蓝色。”

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.

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