Anyone heard of HyPP? Hyperkalemic Periodic Paralysis?

       The Horse Forum > Keeping and Caring for Horses > Horse Health

Anyone heard of HyPP? Hyperkalemic Periodic Paralysis?

This is a discussion on Anyone heard of HyPP? Hyperkalemic Periodic Paralysis? within the Horse Health forums, part of the Keeping and Caring for Horses category
  • Periodic paralysis
  • Nh/hypp in pintos

LinkBack Thread Tools
    04-03-2009, 11:22 PM
Exclamation Anyone heard of HyPP? Hyperkalemic Periodic Paralysis?

HyPP stands for Hyperkalemic Periodic Paralysis. It's a genetic disease in horses that has been traced back to a champion AQHA stud Impressive. Impressive is Ricci's [my horses'] paternal grandfather. Impressive died from HyPP.

I decided to look it up. Episodes of HyPP are basically seizures, from mild to severe, lasting from a matter of seconds to several hours. When horses die from this, it's because it paralyzes the muscles of the heart of lungs, and they have a heart attack, or suffocate. However, an episode can also be a twitch in the muscles that can't be seen by the human eye. HyPP basically makes too much potassium for the horses body to handle, causing the episodes I mentioned earlier. They say it's possible it can be managed in N/H or H/H horses [N/H horses got the gene from one parent, H/H got it from both, and N/N is negative] by getting the hay and grain and pastures tested for potassium levels, saying you want no more than 1%.

Impressive was N/H, and statiscally would pass the gene along to 50% of his offspring. So there was a 50% chance that Ricci's sire had it. The HyPP gene is a dominant one. I managed to look up Ricci's sire and found that he was N/N, so Ricci doesn't have it. I'm going to have her tested though, just to be sure.

However, I was appalled to learn that people are knowingly breeding HyPP positive horses, and even more upset that the registries aren't really doing anything about it. HyPP horses typically make great halter horses because of their build, something to do with the potassium I guess. [My horse was never good in halter.] AQHA ruled that H/H horses cannot be registered, but nothing was said about N/H. And I'm sad to report that the APHA hasn't made any rulings regarding HyPP. [My horse is registered to APHA.]

I guess I just wanted to let everyone know about this. I imagine most people have never even heard of it. But I'm putting this out there for all you horse lovers. I want anyone who's unaware to be aware. While some horses can lead a long productive life without so much as an episode, the chances are just as good that it's life will be short and traumatic. HyPP isn't restricted to just QH's and Paints either, it says Arabians, Appaloosas, Pintos and other stock breeds may be at risk. Any horse that has Impressive in it's bloodlines. Here is the website I got most of my information from, I found it really informative.

Sponsored Links
    04-03-2009, 11:27 PM
I know all about Hypp, My app mare is NH. Though she is being managed on diet and she's never shown any symptoms.

Thanks for posting this and btw, I love that website. Gives so much good info.
    04-03-2009, 11:31 PM
Well thank god for that! Like I said, not all horses show symptoms, and some never do. I just think it's something people should think about, not just skip over it like it's just "some disease."
    04-04-2009, 12:53 AM
>>>> Impressive died from HyPP.

Ummm, Impressive lived until he was 26 years old, and he sired 24 foal crops. All accounts I have read or heard was that he himself didn't show HYPP symptoms, and died of old age.

Also, purebred Arabians are not at risk-- partbred or half Arabs who's other parent is from a stock horse breed might be at risk.

Not posting this to minimize HYPP-- but having questionable/inaccurate statements alongside IMO otherwise informative information could hurt the credibility of the rest of your post.

    04-04-2009, 08:50 AM
My husbands horse died from it so yes, we know all about it. We knew nothing about it before we found out she had it though. That was about 6 years ago and the information was still being slightly veiled by the AQHA. Thanks for posting the information.
    04-04-2009, 04:12 PM
Maybe Impressive didn't die from HyPP, that was just what I read. Anywho, the point I was trying to make was that HyPP can kill. And I also said that some horses can go their whole lives without ever showing a symptom, but they can also go 15 years and all of a sudden have a really big episode.

And I said any horse with Impressive in it's blood could be at risk. So if a horse, any horse, doesn't have Impressive bloodlines, it obviously isn't at risk. Maybe I didn't state that part clear enough.
    04-04-2009, 05:23 PM
If the horse is tested N/N then it does not have the genetic defect, and can't pass it on.
It is great that more information is available than there used to be. Fancy was our first horse and we were stupid first time horse owners. If we knew more at the time I'm sure she would still be around today. We will never own another quarter horse or any dilution of one because of it though.
    04-04-2009, 06:10 PM
Any Impressive horse that is N/N is not at risk in any way its only rumors that some people beleive that they are. Either a horse has HYPP or it doesn't they can't sorta have it any more then someone can sorta be pregnant either you are or your not.
    04-04-2009, 07:22 PM
Vida, I'm right there with you. I love Vega very much, but if I had to do it over again, I would have passed over her.
    04-04-2009, 10:15 PM
>>>> We will never own another quarter horse or any dilution of one because of it though.

IMO, that is a pretty extreme view to take on a defect that is 100% detectable by a simple test that costs 1/2 the price of a set of horseshoes, which only occurs in ONE bloodline in a breed with literally millions registered.... it is TOTALLY avoidable.

Quick Reply
Please help keep the Horse Forum enjoyable by reporting rude posts.

Register Now

In order to be able to post messages on the The Horse Forum forums, you must first register.

Already have a Horse Forum account?
Members are allowed only one account per person at the Horse Forum, so if you've made an account here in the past you'll need to continue using that account. Please do not create a new account or you may lose access to the Horse Forum. If you need help recovering your existing account, please Contact Us. We'll be glad to help!

New to the Horse Forum?
Please choose a username you will be satisfied with using for the duration of your membership at the Horse Forum. We do not change members' usernames upon request because that would make it difficult for everyone to keep track of who is who on the forum. For that reason, please do not incorporate your horse's name into your username so that you are not stuck with a username related to a horse you may no longer have some day, or use any other username you may no longer identify with or care for in the future.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Old Thread Warning
This thread is more than 90 days old. When a thread is this old, it is often better to start a new thread rather than post to it. However, If you feel you have something of value to add to this particular thread, you can do so by checking the box below before submitting your post.

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Hypp!!!! Junebug Horse Breeding 28 04-07-2009 11:51 PM
hypp horses_r_life9 Horse Health 2 02-18-2009 03:06 PM
Hypp bgood400 Horse Health 20 12-04-2008 04:36 AM
HYPP upnover Horse Breeds 11 03-11-2008 10:50 PM
Help with HYPP appylover31803 Horse Health 12 10-16-2007 02:28 PM

All times are GMT -4. The time now is 05:42 PM.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0