Guinea Grass Toxicity

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I have a 12-year-old gelding that can't eat guinea grass (Panicum maximum), not even for three days, because it causes the hair around his face, neck, and belly to fall out in patches. As soon as he stops eating it, his hair grows back within a week or two; by four weeks you wouldn't even know he had lost his hair. He is otherwise healthy, and it doesn't seem to hurt him in any other way.

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