I was checking cows yesterday, and came across calf #6 for 2016:
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Mama had left it there like they do, but whenever I find a newborn by itself I always check to make sure mama is taking care of it. I drove by it a few times and then she appeared.
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My herd was originally a registered Polled Hereford herd. After four Brangus bulls and one Angus Bull, (keep some heifers...sell or trade the bull) most of my herd are Black Baldies, and a few are all black. I have one red one/ white face but she is getting very old.
MARKETABILITY is the best answer on this thread. I remember when Dr. Gary Smith in meats class told us of the marbling study in the 1970's and Angus BARELY beat out Hereford, which beat out all the rest. This manifested itself into the marketing levels you see today of CAB, etc. My point is that the meat has very little difference that can be attributed to the breed, but the perception of value makes all the difference. And the buyers at the auction only have seconds to make a decision, so being black helps sometimes.
Also, my grandfather was a huge Polled Hereford rancher in the early to mid 1900's. He NEVER pulled a calf and never had calving problems. This is not attributed to the breed, it is in the individual genetics for birth weight and body conformation. My grandpa did not keep bulls with too large shoulder/head size compared to the body. These days we are a lot smarter about looking at genetics of the individual sire for calving ease.