Missouri Farmers Warned of Prussic Acid Poisoning
The University of Missouri Extension reports elevated toxicity risks for livestock grazing on sorghum species.
Updated on Oct. 20, 2026 in Agriculture
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University of Missouri Extension officials issued an urgent warning to livestock producers regarding the threat of prussic acid poisoning following recent rainfall. The rapid growth of sorghum species after drought conditions poses a significant danger to cattle currently grazing in the region.
Why it matters
Rainfall after a dry spell triggers new growth in sorghum, which concentrates toxic cyanide precursors in young leaves. If ingested, these compounds can cause fatal poisoning in livestock in as little as 15 minutes.
Producers should wait until sorghum plants reach a height of 24 inches before grazing to reduce toxicity risks. Cyanide typically dissipates from these plants 10 to 14 days after a frost.
The players
University of Missouri Extension
This organization provides research-based education and practical information to Missouri residents regarding agriculture and livestock management.
The details
Symptoms of poisoning include rapid breathing, muscle tremors, salivation, convulsions, and collapse, with animal gums often appearing bright cherry red or bluish. Producers are advised to provide hay or grain supplements to livestock before pasture turnout to limit the consumption of toxic young shoots.
Timeline
Cyanide dissipates from plants 10 to 14 days after a frost.
Monitor exposed animals for emerging symptoms for 12 to 24 hours after exposure.
Market Landscape
This warning fits into the broader agricultural trend of managing crop and livestock health during volatile climate cycles. It highlights the competitive necessity for producers to adopt science-based safety protocols to mitigate avoidable inventory losses.
Livestock owners must adjust their grazing schedules and supplement diets with hay to protect their herds from sudden, potentially fatal poisoning. Failing to wait for plants to mature can lead to immediate and costly loss of livestock.
The takeaway
Livestock owners should proactively monitor pasture growth stages and provide supplemental feed to prevent ingestion of toxic plant material. Keeping animals away from young sorghum shoots is the most effective strategy for avoiding poisoning incidents during drought recovery.
Further reading
For more information on animal safety and agricultural standards, visit Missouri Agriculture.
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Is now a good time to adjust grazing practices to prevent cattle poisoning in your area?
