The first few frosts of the fall bring the potential for prussic acid poisoning when feeding forages. Some forage species, primarily sorghums and closely related species, contain cyanogenic glucosides, which are converted quickly to prussic acid in freeze-damaged plant tissue. Historically in Iowa there are very few documented cases of prussic acid poisoning. However, the risk is present, and good management practices are necessary to minimize the risks.
Iowa State University
Barnhart, Stephen K. and Dewell, Grant A., "Prussic Acid Poisoning Potential in Frosted Forages" (2011). Integrated Crop Management News. 304.
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