As one of the first warmblood studbooks, the KWPN decided to test all active KWPN-approved stallions for WFFS. By publishing the WFFS status of the KWPN approved stallions we want to inform breeders optimally.

Following this decision by the KWPN board, about 250 active and approved riding horse stallions were, on behalf of the KWPN, examined on the presence of the WFFS gene by the Dr. Van Haeringen Laboratory in the Netherlands. Except for the ones that KWPN knows are no longer used for breeding, the tested stallions all have had foals registered the past five years. The result for each stallion is shown under the public header ‘general’ in the KWPN Database and an overview is available on the ‘WFFS page’, on the KWPN website.

Procedures for the WFFS tests for horses
From a technical point of view on breeding, stallions that are carriers can still be used for breeding. Their desired genes can still contribute to the KWPN breeding goal. It is not wise to bring two carriers together though, because that gives a 25% chance of a foal with WFFS. Therefore, it is advisable to test your broodmares so that you know whether your mare is a carrier. At the initiative of the KWPN, a test was made available in the Netherlands by the Van Haeringen Laboratory.

What are the symptoms of WFFS?
The Warmblood Fragile Foal Syndrome is a hereditary disorder that has been recognized in the United States for several years. A foal with WFFS can be aborted, be born prematurely and/or be born with abnormalities. The most important abnormalities in the newborn foal are skin abnormalities (such as too elastic skin that tears easily, wounds that ‘just’ occur) and hyperextension of joints. Usually, the animals will die within 1-2 weeks of birth, or they need to be euthanized.

Stay tuned because next week we will tell you more about WFFS. And we will answer the frequently asked questions! Please click here for more information.

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The KWPN (Studbook of the Royal Dutch Sport Horse) is a Netherlands-based organization specializing in the breeding of jumpers, dressage horses, harness horses, and Gelder horses.

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