AAA only does epd's for registered black angus bred to registered black angus. ASA does epd's for cattle in their database regardless of breed. ASA has programs for cattle that have zero simmental blood up to fullblood. Some angus breeders also are members of ASA because they raise and register simangus cattle as well. Data submitted to ASA for calves from angus bulls or angus calves can affect ASA epd's, but that data and those epd's have ZERO effect on the epd's and data in the AAA database. Kudzu cows bred to a simmental bull - works like this. Join ASA, submit calf weaning weights, calf birth dates, dam info including age, ID/name and breed composition (like 4 year old 1/2 corrientee, 1/4 LH, 1/4 jersey, kudzu cow bessie 872). ASA will "register" the calves in the database, assign registration numbers, using as much info as you submit. What is that worth? Not much in that case imo. But if a person was convinced that they had some cattle that were special and wanted to breed up from that starting point, or develop a group with that breed composition (why?), they could get data processed into pedigrees and epd's. Maybe another example - go back 30 years. Someone crosses some good angus and simmental cattle, sees merit in those cattle and wonder if they can get pedigrees and epd's. AAA had no interest. ASA said sure, we can do that. Which association made the best choice? Maybe both as both are successful, but ASA expanded their market and influence with their decision.
ASA data on those kudzu cows would show breed composition and that figures into the data model. The weaning weight or birth weights as an absolute value don't matter in epd's. It is the difference in weights between different sire groups in the same herd that affects epd's.
An extreme example. Bull A and Bull B are used in the same herd. Calves sired by bull A weaned at 350 pounds. Calves sired by bull B wean at 400 pounds. Are those good bulls with those weaning weights? No idea, but bull B sires calves 50# heavier than bull A. That herd is grazing rocks and dirt. At another place, Bull A sires calves that wean at 650# and bull b sires calves that wean at 700#. They are on great forage and creep. Is that guy using better bulls? Do those calves get better genetics from their sires. They are the same sires as the first herd. So, no concern about hurting the epd's of a super bull by breeding to little kudzu cows. The data model don't work that way. And if all the kudzu cows are bred to the same bull, the bull's epd's won't change at all due to the weaning weights. Because there is not another sire to compare to. All the differences are attributed to the cows.
Are bull owner's notified? Like call them up and tell them that the numbers don't look good and do they want the numbers made public or swept under the rug? Not in the ASA system. It is data driven, not politics driven or fear of the truth driven. We do want the truth don't we? If someone pays $500k for a superbull, don't they still want the most accurate epd's and dna enhanced epd's regardless of whether the numbers or good or bad? Do what is best for all members and the industry?
And I see that GoWyo has already posted essentially the same conclusion.