Join Date: Mar 2009
Location: Washington, USA.
My understanding is that HyPP HAS occurred in horses with no relation to Impressive. Maybe that's incorrect, but I've seen people swear up, down, and sideways that they're horse has HyPP but there was no Impressive in it's lineage.
My mare is Impressive bred, and thankfully, N/N. And yes, ideally, every horse on the planet should be tested and then not bred if it has the condition, but simply stopping the breeding of already known N/H or H/H horses would help tremendously.
A horse can have HyPP and never once show a symptom. Or never show a symptom until it's 23 and then drop dead because the heart basically seizes. Or it can have "seizures" from day one. It can be SLIGHTLY controlled with feed low in potassium, but that's not a cure, it's not even preventative, because the body is still creating the excess potassium. You just aren't doing more to cause it.
"Great spirits have always encountered violent opposition from mediocre minds."