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The birds sold by various large producers such as Foster Farms, Tyson, Pilgrim's Pride, Purdue, etc., are not exactly the same Cornish Crosses you'd get from a hatchery to raise at home. They are similar, but they all have specific lines they buy. The differences are minor. One is skin color. It is genetic, just like it is in people. Some have genes for yellow skin. Some have genes for white. (Silkies have genes for black/blue skin.)
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Good marketing?
Dishonest, or at best,
misleading marketing anyway, I wouldn't call it good.
Yellow skin is not "dirty" or contaminated, or lower qualiy. It just has more beta-carotene (you know, that stuff that makes carrots and squash orange, and is present in green leafy vegetables, and helps prevent cancer) in it, rather than converting it to colorless vitamin A. Vitamin A is good too, but when you eat food with beta carotene, it converts it to vitamin A. A bird with white skin may or may not have any vitamin A. How would you know? You can't see it.
I looked up the Draper Valley Farms website. They raise chickens in Washington and Oregon. They say their chickens are fed a vegetarian diet of CORN and SOY. Chickens are not natural vegetarians, so that's an unnatural diet right there, and those are white skinned birds, but they eat corn. So chickens raised in Washington eat corn, just like chickens raised other places.
I lived in Washington about 15 years. I don't recall ever hearing that about WA chickens. Maybe it's a brand new myth? Anyway, it's not true.
Here's a chart that shows the skin color of different breeds.
http://www.ithaca.edu/staff/jhenderson/chooks/chooks.html The skins will be those colors whether they eat corn or not. Though a yellow skinned bird
might be pale, if it's diet is really poor, and it doesn't get the proper nutrients to produce the yellow pigment. Chickens that never get a bite of anything truly natural, like
green things outdoors, tend to have very white meat. No beta carotene. Sort of like the caged battery hen layers that lay those watery, tasteless eggs with the anemic-looking pale yellow yolks. (they should be a deep orange)