Toxin Topic: Johnsongrass Poisoning in Horses
Johnsongrass (Sorghum halepense) is a drought-tolerant noxious weed that can infiltrate pastures and hayfields. Especially in pastures that are not mowed and maintained, drought conditions can cause many grass species to die off while Johnsongrass survives and flourishes. Horses grazing in such fields could ingest large amounts of Johnsongrass if supplemental hay is not provided.

All sorghums, including Johnsongrass, are associated with four major disease syndromes:

  • Neuropathy (nerve damage) and teratogenesis (damaging effects to the fetus);
  • Photosensitiz

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