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The ergot is a small callosity on the underside of the fetlock of a horse or other equine. Some equines have them on all four fetlocks; others have few or no detectable ergots. In horses, the ergot varies from very small to the size of a pea or bean, larger ergots occurring in horses with "feather" – long hairs on the lower legs. In some other equines, the ergot can be as much as 3.8 cm in diameter.
Ergot comes from the French word for rooster's spur.
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