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Carolyn, N/H (heterozygous) horses can show physical signs of the disease. I 
took this off of the AQHA website. They have an excellent resource center 
for HYPP.

Can symptoms of HYPP vary in severity?

Clinical signs of HYPP do vary widely among different horses. Homozygous 
horses are affected more severely than heterozygous horses. Under ideal 
management practices, the defective gene does not appear to have adverse 
effects, but stress and/or increased potassium in the serum can trigger 
clinical signs of muscle dysfunction. Why some horses manifest severe signs 
of the disease and others exhibit little or no signs is unknown, but 
currently under investigation. Unfortunately, a horse carrying the defective 
gene, but showing minimal signs, has the same chance of passing the gene to 
future generations as does the affected horse with severe signs.


Sindy McCosker
Newcastle, CA (The Gem of the Foothills)

"Some horses come into our lives and guickly go. Others stay a while, make 
hoofprints on our hearts and we are never, never the same."
                                   -anonymous-





> From: "Carolyn Burgess" <carolyn_burgess@xxxxxxxxxxx>
> To: Jon.Linderman@xxxxxxxxxxxxxxxxx
> CC: ridecamp@xxxxxxxxxxxxx
> Subject: [RC]   HYPP-N/H
> Date: Mon, 13 Jan 2003 12:27:46 -0500
>
> Horses that are HYPP-N/H will have no problems in terms of physical issues 
> related to HYPP.  However, they are carriers and if breed to another 
> HYPP-N/H horse, will have a 1 in 4 chance of producing a horse with HYPP, a 
> 1 in 2 chance of producing a N/H horse and a 1 in 4 chance of producing a 
> N/N horse.  If breed to a N/N horse they will still have a 1 in 2 chance of 
> producing a N/H horse, or another carrier.
>
> Carolyn Burgess
>
>
>
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