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Toxic Plants Affecting Livestock: A Guide to Identification and Management

This guide provides information on several toxic plants such as Threadleaf Groundsel, Riddell Groundsel, Cocklebur, Inkweed, and Tansy Mustard, detailing their characteristics, toxic agents, and impact on livestock. Learn to recognize and manage these plants to safeguard your cattle, horses, sheep, and goats.

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Toxic Plants Affecting Livestock: A Guide to Identification and Management

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  1. Threadleaf Groundsel, Senecio (Senecio longilobus) • Many-stemmed, evergreen composite. • Toxic agent pyrrolizidine alkaloids. Cattle and horses are about equally sensitive to this plant. Sheep and goats are more resistant.

  2. Riddell Groundsel, Broom Groundsel (Senecio riddellii) • Herbaceous, perennial of sunflower family. • Toxic agent pyrrolizidine alkaloids.

  3. Cocklebur • Coarse, rough, annual weeds. • Toxic agent is carboxyatractyloside, a glycoside causing hypoglycemia. Can poison all classes of livestock.

  4. Inkweed, Thickleaf Drymary (Drymaria pachyphylla) • Smooth, hairless, short-lived annual. • The toxic agent is unknown. Plant poisons cattle, sheep and goats.

  5. Tansy Mustard (Descurainia pinnata) • Annual forb growing to 2’. Single-stemmed, leafy throughout and covered with fine, gray hairs. • Toxic agent is unknown. Large quantities of the plant must be consumed before poisoning occurs. Tansy mustard also accumulates toxic levels of nitrate.

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