From drought to frost for forages

By Jason Hartschuh, CCA, and Kyle Verhoff, Ohio State University Extension

This year is presenting many challenges when it comes to forage toxicity and ensuring that we have safe feed for our livestock. Drought conditions have led to an active discussion on forage toxicity and the potential for frost in the future presents an additional concern. These environmental conditions increase the risk of prussic acid poisoning, nitrate poisoning, and increased bloat in multiple methods of feeding forages. Recent rainfall has finally allowed for rapid forage growth but unfortunately in some species, this rapid growth poses a risk to your livestock during future frost events.  

What is prussic acid toxicity?

Prussic acid toxicity is the accumulation of prussic acid (i.e. hydrogen cyanide) in forage plant tissue. Prussic acid is the product of a reaction between two naturally occurring plant molecules, cyanogenic glycosides and degrading enzymes. Plant cell walls usually separate the two, but a frost event freezes the water in a plant cell, rupturing the cell wall and allowing the formation of prussic acid.… Continue reading