Hmm, number of bits to 'pick at' with what you quoted there, making me think your Count didn't understand horse psychology or training quite as well as he thought he did...
I wanted to prove that jumping is an unnatural movement to the horse, but that any horse could become a good jumper if it was trained in such a manner that it did not realize it was doing anything unnatural. ... maintaining that the moment the horse was punished it would associate jumping with pain.
I don't believe my brumby was ever told it was unnatural for a horse to jump - he loved jumping stuff from day 1, despite never being taught - he wasn't trained for anything but being led when I got him. He did train himself(thank goodness without injury) not to jump fences when he went over one and got his hind feet caught, went crashing down. And thank goodness he was going fast enough to clear a CATTLE GRID recently when he got away in a strange place & tore up the track to go after his mates!!
As to 'if it did not realise it was unnatural' - we know that that is a rational kind of thinking that just doesn't apply to horses. And as we also know that horses learn from *instant* association, whipping a horse AS they're jumping would put it off jumping, but whipping it because it WON'T jump is a different matter.
The result was amazing. After some months ... jump happily over it, then stop, look back and ask me for sugar!
I was not
amazed that after only literally MINUTES, that same brumby learned to jump very keenly under a rider, but I was surprised how apparently 'solidly' he learned virtually everything he was taught, after very few repetitions. Which did create a few... idiosyncrasies that had to be 'untrained'...
The very first lesson of jumping under saddle(well, bareback but anyway) I did with him on a lunge, as my eldest also wanted to learn to jump & had never done it, and I felt I was a bit big for him for jumping. So... he went over the jump, I said 'Good!', he landed, stopped, my daughter nearly came off(or a couple of times did), Jake looked at me & nickered, knowing a treat was coming(Good! is the bridging signal)... Only the very first lesson we did this, and my kid & pony got rapidly good at jumping. He found it easy to teach him not to stop straight after the jump.
BUT a month or so later when my son wanted to try cantering bareback for the first time, I again said 'lets start on lead'. First time I'd lunged this character since the jumping lesson, and when I asked him to speed up, he JUMPED thin air! Thankfully son didn't come off, and we gigglingly punished him for the Wrong Answer a couple of times & he realised that wasn't what he was supposed to do. But still, years later, something we giggle about & didn't ever teach him better for, is that when anyone leans forward to dismount, or falls off, he slams on the brakes(if he's not stopped already), nickers & turns to the rider for a treat! I figure it's a good 'safety chain' that the horse won't run off & leave the rider if they fall off on the trail!
never once jumped over the low, 3-foot rails of the grazing paddock simply because I never once made it jump without a rider
I've taught quite a few other horses to jump(logs on the track, low fences etc, never been into big jumps), but I'm far & away from expert at jumping or training for it. I have always taught a horse to jump without a rider first. Even my brum who came to me happy to jump fences, without being taught has never, since the first try was a fail, tried to jump any fence, and I don't recall one single other horse ever doing so either.