Arabians, pure and part-bred
Friesians, pure and part-bred
Fell Ponies, Dale Ponies and Gypsy horses, pure and part-bred
Quarter horses and related breeds, pure and part-bred
Saddlebred and related breeds, pure and part-bred
Coat colour tests
HERDA is an autosomal recessive disorder, meaning that it is not sex-linked, and that HERDA carriers with one copy of the gene are not affected. HERDA is part of the Quarter Horse and Paint Horse 5-panel, and is most commonly found in cutting lines.
Horses with two copies of the HERDA gene have extremely fragile skin, particularly along their back. Their skin can rip or tear easily, and the large wounds that result from this tearing are painful and like most wounds on horses carry a substantial risk of infection.
Our test is based on the single nucleotide polymorphism identified by Tryon et al. (2007): doi:10.1016/j.ygeno.2007.03.009
HERDA lesions usually occur on the back and can be very large. Image linked from here.