I would find it interesting if the expressed goal of moving the breed forward commercially was substantiated by approving a policy relating to the registration status of known and potential carriers of known genetic defects that was consistent with the policy of the American Angus Association. Page 54 of Angus Breeders Guide
http://www.angus.org/Pub/brg.pdf
Commercial success of Durham Reds, Durham Blacks or any Shorthorn cross could only be advanced by holding our registration and potential carrier identification process to the same standards as Angus.
Clear identification of potential carriers "by pedigree" and dna verified carrier free status of the progeny ( not steers, only bulls and breeding females) of potential carriers seems a responsibility we must assume in order to sell viable registered seed stock to commercial operations.
Perhaps the last thing an Angus based producer would want would be to breed another dimension of defects into their Shorthorn cross replacement heifers. It seems the last thing we would want would be for there to be a valid reason, down the road, not to breed those F1 replacements back to Shorthorn bulls without a lot of guesswork, homework and risk.