I see these certified black angus burgers and steaks advertised everywhere but they cant really certify that. First off they pretty much classify any black animal going through the ring as "black angus". I know some one that raises tarentiase(spell wrong) and they can be anywhere from light tan to red to black and she said the sale ring calls the black steers black angus everytime. Second they cant really tell you whether the package of hamburger you just bought is a hereford, black angus, or beefmaster. So there really is no reason for black calves to bring thirty cents more than a red one in the sale ring but it still happens.
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I think there are two forces at play here: One the verifiable facts from years ago when Angus cattle really did grade higher and more often than other types of cattle. They were early maturing, easy fleshing, easy marbling moderate sized cattle. Remember, 30 or so years ago, "Choice" was today's high Prime. Today's Choice was "yesterday's" "Good". Grocery stores wouldn't have dared display and sell the type of beef we see in the meat counters today graded "Select"! With the push to leaner beef, the industry went whole hog to ultra lean, non-marbled carcasses. The commercial breeders/feeders had to follow. The USDA followed by lowering grand and yield standards to meet demand and "science".
The natural progression in the show ring was to penalize cattle carrying too much finish. Then, came the giants. If you're selling on pounds, bigger becomes better in one's mind. However, the black hided, traditionally easier grading cattle still brought, and bring, better prices on the big commercial market in the big commercial sales. However, for many southern and Mexican breeders, they are seeking out the red hides (ie Red Angus) because they seem to do better in the heat and bugs without sacrificing the good beef characteristics. I'm seeing red hides outselling black hides fairly consistently be it in the feeder sales or bull sales. My opinion is that is has less to do with "untainted" genetics as it does with consistency and good performance in all climate conditions. "Eared" cattle (Bos Indicus influence) are always penalized compared to good Bos Taurus cattle.
As to verification of black cattle being called "Angus", go here for USDA requirements: http://ams.usda.gov/lsg/certprog/Schedules/sched-GLA.htm
And here for Certified Angus Requirements from the American Angus Ass'n/CAB: http://www.cabpartners.com/facts/faqs.php