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"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

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BRIEF: Do you know of a list that compares the plant toxicity in horses and ruminants?

Do you know of a list anywhere that compares and contrasts which plants are toxic to horses but not ruminants and vice versa??


Well, alsike clover, yellow star thistle, russian knapweed and red maple are equicides that don't hurt cattle that we know of. And ruminants are more likely to form 3methyl indole from high protein lush pastures and suffer the grunts (acute bovine pulmonary emphysema) than horses. In the lab, if you pour 3MI into a horse, it will get respiratory symptoms, but without a rumen, there is no practical way for horses to get this nutritional disease in the real world. 3MI also gives cat feces that special aroma it has, but that is anopther story...