!!!! Spider syndrome is LETHAL. DEADLY. And parrot mouth can be if it is extreme enough. I for one am not going to spoon feed a sheep or cow! But a few years ago a market heifer won the ISF that was so monkey mouth she couldn't eat.
I have been a big part of the sheep industry and have compared it to the TH/PHA ordeal. The breeders that had carriers fought the DNA testing tooth and nail, and denied and squalled, and downplayed, UNTIL the buyers demanding (and sometimes not so nicely) the DNA results. Finally everyone started testing and guess what....the spider gene is almost gone, and the scrapie suspectability gene is slowly declining. (in commercial herds is it all but gone).
So maybe the cattle producers are just behind "us" progressive sheep breeders!!