Forage management considerations after frost


By Rory Lewandowski, OSU Extension Educator, Wayne County and Mark Sulc, Extension Forage Specialist, The Ohio State University

Heading into November we had a few, light scattered frosts in the area that have generated some questions about forage use after a frost. The two most common questions concern the use of warm season grasses in the sorghum family and grazing alfalfa. The issue with grasses in the sorghum family, which includes sorghum-sudangrass hybrids, sudangrass and Johnsongrass in addition to sorghum, is that they contain cyanogenic glycosides and enzymes that convert those compounds to free cyanide (sometimes called Prussic acid) within their cells. Prussic acid or cyanide is a lethal toxin.



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