When I was in shoeing school, we put the hooves of several horses in a metered shop press. Black and white hooves from the same end of the same animal kind of thing. It was a dead split. Half the time, a black hoof would fail first, half the time white. Of course, there was no way to gauge sensitivity, but we did figure out how to gauge the pressure it took to shove a coffin bone out the bottom. Later in life, I talked a vet into doing it while watching with a fluoroscope after the necropsy was complete. It was very interesting to see the failure of the sensitive and insensitive lamina in real time. I would bet that the results of our experiments will never be officially recognized, but that's the conclusion we came to, right or wrong.
Edit to add: The horses were dead before we took their feet off and put them in the press.