Jack, Its funny that you posted about this because my dad and I were just discussing it this morning. Bucking bull breeding programs are way ahead of us in the soundness department. They are tight bellied and of course extremely atheletic. Its amazing how their selection criteria for basically just bucking ability made what used to be many different types years ago into one very similar type now. Also you would be very amazed at how close bred the bulls from the most successful breeders are. The Growney/Kish, Nevada/Joe Berger, Alex Naccarato, and the D&H Cattle Company bulls are highly inbred. Of course some of the most extreme for bucking abilty are outcross outliers or just lucky sale barn purchases. The outfits I mentioned before though always have bulls bucking at very high levels for longer periods of time where some of the more extreme outcross bulls come and go even quicker than mainstream angus. Some of these programs have 40-50 years of breeding into these bulls. These bulls are certainly a very interesting study.