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Sometimes a single plant prevents managers from grazing livestock in an area with good forage production. Often the plant has high agronomic value, like fruit trees, Douglas fir trees or grapevines. Livestock could easily graze fruit orchards, forest plantations or vineyards, improving fruit harvest and tree growth, if only they could be persuaded not to eat the trees or vines. In such cases, the key is to train livestock to avoid the food.