Appaloosas & Australian Spotted Ponies Inc.
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There are currently five genetic tests for genetic diseases know to exist in Quarter Horses and related breeds, including Appaloosas. It is unknown whether these five genetic conditions also exist in Australian Spotted Ponies. A&ASP Inc. believe that as a breed society, we should be leading the way in the eradication of these five genetic diseases within our breeds.

DOMINANT GENETIC DISEASES
Three of these genetic diseases, HYPP, PSSM1 and MH, are inherited in an autosomal dominant fashion. This means that if a horse has one copy of the disease allele, it has the genetic disease. This is illustrated below.

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Individuals which are homozygous affected (have two copies of the disease allele) will always pass the genetic disease onto their progeny. Individuals which are heterozygous affected have a 50% chance of passing the genetic disease onto their progeny. To eliminate these diseases from the gene pool, only those animals which are unaffected (have no copies of the disease allele) should be bred forward.

Hyperkalemic periodic paralysis (HYPP) - The mutation causing HYPP causes affected individuals to have episodes of muscle spasms and/or paralysis. Some HYPP episodes have related in the death of the affected individual. To date, HYPP has only been confirmed in descendants of the American Quarter Horse stallion Impressive.

Polysaccharide Storage Myopathy Type 1 (PSSM1) - PSSM1


Malignant hyperthermia (MH) - MH


RECESSIVE GENETIC DISEASES

Two of the genetic diseases, HERDA and GBED, are inherited in an autosomal recessive fashion. This means that the horse must have two copies of the disease allele to have the genetic disease. This is illustrated below.

Picture
Affected individuals should not be breed. If a horse only has one copy of the disease allele (and one copy of the normal allele), it is known as a carrier. Carriers do not have the genetic disease, but they can pass the genetic disease onto their progeny if mated with another carrier. For this reason carrier x carrier matings should be avoided. Carrier x homozygous dominant matings will not produce affected progeny.
Picture
Hereditary equine regional dermal asthenia (HERDA) - The

Glycogen Branching Enzyme Deficiency (GBED) - The


TESTING

A&ASP Inc. has a genetic testing

NEW A&ASP Inc. POLICY REGARDING GENETIC DISEASES
Any animal registered in Category A, Category B or Category H after June 2016 MUST be tested for all five genetic disorders PRIOR TO BEING BREED.

Remove affected (Category C)
Carriers allowed but MUST NOT BE BREED to other known carriers.

Genetic test results will be included on the horses registration papers

Clear by parentage


A&ASP Inc. will not register any new animals known to be affected
Hereditary equine regional dermal asthenia GBED



TESTING



NEW A&ASP Inc. POLICY REGARDING GENETIC DISEASES
Any animal registered in Category A, Category B or Category H after June 2016 MUST be tested for all five genetic disorders PRIOR TO BEING BREED.

Remove affected (Category C)
Carriers allowed but MUST NOT BE BREED to other known carriers.

Genetic test results will be included on the horses registration papers

Clear by parentage


A&ASP Inc. will not register any new animals known to be affected
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