Ergot (horse anatomy)
The ergot is a small callosity (Calcar metacarpeum and Calcar metatarseum) 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 (1.5 in) in diameter.
Ergot comes from the French word for rooster's spur.
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