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Ponderosa pine and broom snakeweed: poisonous plants that affect livestock.

Ponderosa pine (Pinus ponderosa) and the snakeweeds (Gutierrezia sarothrae and G. microcephala) are two groups of range plants that are poisonous to livestock. Ponderosa pine causes late-term abortions in cattle, and the snakeweeds are toxic and also cause abortions in cattle, sheep, and goats. Research is underway at the USDA-ARS-Poisonous Plants Research Laboratory to better understand livestock poisonings caused by grazing ponderosa pine needles and the snakeweeds and to provide methods of reducing losses to the livestock and supporting industries. This review includes the history of the problem, a brief description of the signs of poisoning, the research, to identify the chemical toxins, and current management practices on prevention of poisonings.