Totally insane! I have no idea why so many people love to live on the edge and even think of doing this, especially with all we know about the genetics of defects like this. If you have ever seen a TH calf, you would never try this again! Before TH was identified, we used an Improver grand son on a set of heifers that were great grand daughters of Improver. We had 5 TH calves in one week when they started calving. Every one was much alive and trying to get up. Their back legs were twisted together and short heads with weird placed eyes. Three of the 5 had holes in their skulls and part of their brain pushing out with every breath they took. This is not anything I ever want to experience again.
In this day and age, when we have genetics from all over the world available to us, I cannot understand why we just can't raise some cattle that can improve our beef industry. It should be as much fun to show breeding cattle as it is to breed show cattle.