Rain-Driven Plant Growth Raises Prussic Poisoning Concern for Livestock
Livestock producers in the Quincy-Hannibal-Keokuk region are alerted to the risk of prussic poisoning in cattle and horses. Recent rainfall after drought has stimulated new growth in plants like Johnsongrass, which can contain precursors to prussic acid. Producers are advised…
Quincy Hannibal Keokuk, IL, October 20, 2026 —
Livestock producers in the Quincy-Hannibal-Keokuk region are being alerted to the risk of prussic poisoning in cattle and horses as recent rainfall following drought has prompted new plant growth.
Johnsongrass is among the plants identified as a concern. The new growth can contain precursors to prussic acid, according to the information provided. The warning urges producers to take precautions before allowing hungry animals to graze on these plants.
Suggested precautions include providing supplemental feed and allowing plants to mature before grazing. The summary does not specify how long producers should wait, how to assess plant maturity, or what amount of supplemental feed is appropriate.
The alert is tied to the shift from drought conditions to rainfall and subsequent plant growth. It does not provide dates, identify the organization issuing the warning, or report confirmed cases of poisoning in the region. It also does not specify the number of farms or animals potentially affected.
The information names both cattle and horses as animals at risk, but offers no further detail about symptoms, treatment, or veterinary guidance. Producers are advised to use caution with hungry animals and newly growing plants, particularly Johnsongrass. No additional recommendations or local incident reports were included in the summary.
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