With its jet-black coat, powerful frame and signature high-stepping gait, the Friesian horse has become increasingly popular
over the past 20 years. A Friesian named Othello played the prominent role of the stallion Goliath in the 1985 film Ladyhawke. Friesians have increasingly been favorites of Hollywood with roles in Conan the Barbarian, Eragon, The Mask of Zorro, Alexander, The Chronicles of Narnia, Clash of the Titans and The Hunger Games. This familiarity and growing popularity mean that practitioners are likely to see even more Friesian horses in their practices.
A purebred population leads to problems
The Friesian breed originated in the Netherlands and is thought to have come from primitive forest horses native to that land.
Many experts think that during the 16th and 17th centuries, some Andalusian blood was added to the developing Friesian breed,
although little direct documentation of that exists. These horses were strong and heavy enough to carry a knight in armor
but were more graceful and athletic than heavier draft breeds of that time.
With their distinctive look, Friesian horses have increasingly been favorites of Hollywood and also popular with horse owners.
But inbreeding has led to many abnormalities equine practitioners should be on the lookout for. (GETTY IMAGES / ERIC ISSELTE)
Despite centuries of breed development, the Friesian studbook wasn't started until 1879. But this particular type of horse
has been purebred since that time. For well over 100 years, Friesians have been tightly inbred.
With their recent popularity leading to greater demand and increased breeding with restricted bloodlines, Friesian horses
are facing some significant problems that all practitioners should be familiar with. A number of suspected genetic disorders
affect the Friesian horse. Identifying these problems early will aid clinicians in prompt, accurate treatment and, equally
importantly, will possibly help remove these animals from breeding programs. This may be the single best step toward eliminating
these problems from the breed.
Roughly 7 percent of the Netherlands' horse population is Friesians. So it's no surprise that from 1995 to 2003, 7 percent
of the caseload at Utrecht University's College of Veterinary Medicine in the Netherlands and Ghent University's College of
Veterinary Medicine in Belgium was composed of Friesian horses.1 What was surprising, however, was that veterinarians at these two schools began to notice a high incidence of certain clinical
problems among Friesian horses—much higher than the 7 percent population should predict. Researchers from these institutions
have subsequently joined with a number of private clinics in these countries and are now trying to document problems in Friesians
and educate veterinarians worldwide about these conditions.
One of the best-known disorders in the Friesian breed is dwarfism. The condition manifests with growth retardation mainly
in the limbs, which are 25 percent shorter than normal. A Friesian dwarf is about 50 percent smaller than an age-matched normal
Friesian foal.1 This condition is easily observed because of the larger head, broad chest and disproportionately long back with short limbs.
Hyperflexion of the fetlocks and narrow, long-toed hooves are also seen in these animals. Tendon and ligament laxity varies
greatly between dwarf Friesians and normal ponies, with dwarfs showing excessive looseness to these structures and, often,
resultant load failure. Normal Friesians have tendon and ligament stretch properties in between those of dwarfs and normal
ponies.2 Some researchers think the Friesians' increased laxity is what creates their characteristic high-stepping, dancing gait.
Many of the problems currently being investigated in the Friesian breed also stem from abnormalities in ligaments, or, more
specifically, from a systemic collagen-linked disorder. It would be ironic if the condition that allowed the Friesian breed
to exhibit its signature movement were also shown to be behind many of the devastating problems that threaten this breed.
The Friesian registry is no longer allowed to breed dwarves, and hopefully this problem will eventually disappear. But because
this condition was tolerated and dwarves were still used as broodmares until relatively recently, dwarfism is likely to remain
a part of the breed's genetics for some time.