What is the possibility? (HYPP/HERDA)

I have a 9 year old gelding who is N/H
Does anybody know what the probability is for an attack?
He hasn't had an attack that I know of since the time that I bought him, in March. He's 7 times bred to Impressive, 4 times to Conclusive, 2 times to Kid Clu (N/H), once to Zip To Impress, and even goes back to Poco Bueno.
His registration papers say nothing on HERDA, so how do I get him tested, or would it have shown up by now? I'm panicking a little bit here!

Check out animal genetics I believe a whole spectrum done on genetic diseases is $95 and each is $30.00
I would be asumming it would be a 50% chance to pass to off spring if he were a mare or stallion, so I would also assume a 50% chance he could have an attack.. Don't quote me but I think that's how it works.

He could go the rest of his life with out an attack or he could have one tomorrow. There is no magic "thing" out there that you can do to keep an attack from happening. Your best bet is to do your research and prepare for one.

HERDA testing is not necessary for two reasons. First, It has been shown to only affect those who are homozygous for it. You would not be able to ride him without causing skin injury, so it would be pretty obvious if he had it. Second he is a gelding, and even if he was a HERDA carrier, he cannot reproduce.
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Somebody apparently liked Impressive O.o


I have a friend who's horse is N/H. She has small attacks, just the muscles on one of her hips twitches hard for like 30 seconds straight, like she is trying to get rid of a big horsefly.

Since you know he's HYPP N/H you should definitely keep an eye on his diet (potassium in particular).

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