I have on my farm today 2 of what I believe are among the very finest bulls I have ever used, AI or natural. Both are triple clean. The two maternal great grand sires of one of the bulls are DSH. Yes, DSH. I raised Oakview 2 + 2 long before anybody knew anything about DS. I saw JBC Ruby Pooh long before anybody heard of DS. Neither bull showed even the remotest sign of any abnormality. Stinger appears in 2 + 2's background, but I can't see any PHA in Ruby Pooh's pedigree after a quick glance. I don't think PHA is a requirement for the DS physical defect to show up, just may increase the frequency. No one can trace Improver's pedigree or true background far enough to know just what it really is, but it's doubtful there was any PHA in it. The point is, there are so many great cattle out there that descend from defect carrying parents that I would hate to think where we'd be without them. I agree with those that say if you eliminate offspring of carrier cattle, you are eliminating all the genetic diversity, and potential for improvement, they might have. Our genetic base is too small to do that. Since 2 + 2 and Ruby Pooh are both DSH, 100% of their progeny would be DSC, at least. If you eliminated all their progeny because they were carriers, the dam of my bull would not exist and a bull that I wouldn't trade for anything wouldn't exist. As it turns out, I have what I think is one of the finest triple clean or otherwise Shorthorn bulls in existence on my farm. I vote for allowing those that want to manage the genes to do so. Just keep putting on the labels.