@Brute 23 @farmerjan we too know from experience that those black calves marked like a Hereford with white neck, ears, legs and belly will get a major dock.
We've used a cross bred bull with only 1/4 Hereford in him the rest being Angus, when paired with Hereford or BWF cows the calves could come out with a lot of white.
I see some of the "black Hereford" bulls and immediately think nope not with our cows.
I've been saying too, that Herefords and the so called "black Herefords" don't really work with mixed herds especially when cows are Hereford or HerefordX.
We've had a calf with white legs and neck sorted from a group, and he had the same genetics as the others.
If a person has a cowherd that is atleast several generations Angus then a real red Hereford makes a good cross, and I don't see any point to a "black Hereford" for a herd like that.
Maybe in a herd of red Angus or heterozygous black, solid black cows a "black Hereford" that was homozygous black might be an option if the goal is black calves, but I believe if the goal is to maximize income from the calves a Hereford and even the "black Hereford" is fairly limited in the types of herds they can work in.
I believe there are other breeds that cross better with wider variety of cowherds.