Hereditary Equine Regional Dermal Asthenia (HERDA)


Hereditary equine regional dermal asthenia (HERDA) is a degenerative skin disease affecting predominantly American Quarter Horses. Within the population about 1.8-6.5% individuals are carriers of the autosomal-recessive disorder.
Normally foals are being born without any signs of the disease. At the age of 2 years or at the time when the horse is being saddle broken, the first symptoms occur. Affected areas of the skin are distributed irregularly all over the body with a predilection for the area on the back and face.
The skin of affected horses is hyperextensible skin, scarring, and shows severe lesions along the back.
Histological examination of skin biopsies are not suitable for diagnosis of HERDA and can only provide hints. Currently there is no specific treatment available and horses often have to be euthanized.


Quarter Horses, Paint Horses, Appaloosas and related breed

Trait of inheritance


Test duration

3-5 days after arrival of the sample in the lab


The DNA test is performed out of EDTA blood or or 20-30 hair roots from mane or tail. Test kits can be ordered free of charge. (order-form). If hair is sent in, possibly the genetic material is not sufficient to run the test. In this case it would be best to send in an EDTA blood sample.

Testing procedure

Please send in your sample together with the lab order genetic. Results will be transmitted optionally via post, fax or email. After completion of the test you will receive a separate invoice. Payment can be made via credit card or bank transfer.
Breeding club discounts apply if a copy of the membership card is sent together with the respective samples. Due to administrative reasons the invoiced price can not be altered subsequently.


Please contact our molecular biology team for further questions.

Steubenstraße 4
D-97688 Bad Kissingen

Telefon: +49 (0)971 72020
Fax: +49 (0)971 68546


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