DNA test for Hereditary Equine Regional Dermal Asthenia (HERDA). This test verifies the presence of the recessive HERDA gene.
- 20 to 30 - hair roots - envelope
- 5 mL - blood - K3 EDTA tube
- 2 to 5 working days
- This DNA test helps breeders to identify horses that carrying the HERDA recessive mutation. Informed choices can be made for breeding selections, and prevent the born of affected foals.
The DNA test verifies the presence of the recessive HERDA gene and presents results as one of the following:
- N/ - Negative for HERDA. Absence of the defective gene responsible for HERDA.
- N/HERDA - Positive heterozygous for HERDA - carrier. Presence of a mutated allele responsible for HERDA. The horse is a carrier for the HERDA mutation and can pass on a copy of the defective gene of their progeny when bred.
- HERDA/ - Positive homozygous for HERDA. Presence of two mutated alleles responsible for HERDA. The horse is affected with the HERDA and will pass the HERDA allele to 100% of its offspring.
Hereditary equine regional dermal asthenia (HERDA) is a genetic skin disease predominantly found in the American Quarter Horse. Within the breed, the disease is prevalent in particular lines of cutting horses.
HERDA is characterized by hyperextensible skin, scarring, and severe lesions along the back of affected horses. Affected foals rarely show symptoms at birth. The condition typically occurs by the age of two, most notably when the horse is first being broke to saddle.
There is no cure, and the majority of diagnosed horses are euthanized because they are unable to be ridden and are inappropriate for future breeding. HERDA has an autosomal recessive mode of inheritance and affects stallions and mares in equal proportions.