Plants Poisonous to Livestock

Oaks (Quercus spp.) Oak are perennial shrubs to large deciduous trees. Leaves grow in clusters of two to four leaves at the tips of all twigs. Most species can cause livestock poisonings. Gamble and shinnery oak are responsible for most livestock poisonings. Bur oak has deeply furrowed bark with deeply lobed leaves, ten inches long. Upper surface of the leaves are dark green, undersides are silver and hairy. Pin oak, red oak and white oak are also common oak species found in the upper Midwest region of the United States.

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