A foal with WFFS can abort during pregnancy, be born too early, and/or be born with abnormalities. The important abnormalities that can be prevented are for example a very fragile skin or overextension of the joints. Affected foals usually pass way a few weeks after birth or must be put down.
WFFs is, as far as known, inherited recessively. This means that a carrier of one harmful mutation doesn’t get sick itself but can pass on the mutation. When both the stallion and mare are a carrier there is a 25% chance that the offspring will have the disorder, a 50% chance that the offspring is a carrier as well and a 25% chance that the offspring don’t have the harmful mutation at all. This is the reason why it is important to test if the parents are carriers for breeding especially.
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