question - are there any HYPP horses that are NOT impressive bred?
Nope. I just went to the AQHA website and copied the fact sheet for everyone. AQHA's HYPP FACT SHEET
Hyperkalemic periodic paralysis (HYPP) is an inherited disease that leads to uncontrolled muscle twitching or profound muscle weakness, and in severe cases, may lead to collapse and/or death.
HYPP is listed as a genetic defect in AQHA's rules, along with Parrot Mouth and Cryptorchid conditions.
To date, HYPP only has been traced to descendants of IMPRESSIVE, #0767246.
Having negative (N/N) results on file may prevent a horse's offspring from being tested.
Foals born in 1998 and later and tracing to IMPRESSIVE will have a statement placed on their Certificates of Registration that recommends testing for the condition unless test results indicating the foal is negative (N/N) are on file with AQHA.
AQHA will test any foals who are required to be parentage verified and who trace to IMPRESSIVE for HYPP prior to them being registered. This testing will be performed with the same DNA sample submitted to the laboratory for parentage verification.
AQHA will accept HYPP test results only if performed through a licensed laboratory. These currently include:
Veterinary Genetics Lab at University of California at Davis
Shelterwood Laboratory at Carthage, Texas
IDEXX Laboratories, Markham, Ontario
NSW Agriculture in Australia
Veterinary Diagonostics Center, Fairfield, Ohio, (800) 625-0874
Stormont Labs, Woodland, California, (916) 661-3078
Gene Check, Inc., Ft. Collins, Colorado, (940) 472-9951
Maxxam Laboratory at Guelph, Ontario
Other laboratories are in the process of being licensed.
Beginning with the 2007 foals, all Impressive progeny are required to be parentage verified and HYPP tested subject to the conditions listed in rule 205. Any that test H/H will not be eligible for registration.
Possible results of HYPP testing are N/N, N/H and H/H.
HYPP is inherited as a dominant trait, which means a heterozygous (N/H) stallion or mare bred to a normal (N/N) horse will result in approximately half of the offspring being affected and half being normal. The rare homozygote (H/H) usually is severely affected with the disease and will pass the gene to its offspring 100 percent of the time.
HYPP can be treated through diet and medication in most cases.
AQHA Testing Kits can be ordered for $40.