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CONDITION HORSE Yellow Star Thistle Poisoning (Nigropallidal Encephalomalacia or Chewing Disease) in Horses

Yellow star thistle poisoning, also called nigropallidal encephalomalacia or “chewing disease”, occurs when a horse eats a toxic amount of the yellow star thistle plant. Yellow star thistle is an annual weed commonly found in western North America, the Mediterranean, Argentina, and Australia. 

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