AMES, Iowa — Concern over health issues in cattle that consume ergot-contaminated grain motivated Iowa Beef Center staff at Iowa State University to investigate potential issues around ergot contamination. The 2013 emergence of ergot contamination of forages and small grains in Iowa began with the cool wet spring that allowed the increased prevalence of Claviceps purpura, the fungus that produces ergot.
“This fungus produces a group of chemicals called alkaloids, and the alkaloids cause vasoconstriction with many different clinical signs, depending on effects of consuming contaminated grain or forages,” said Joe Sellers, Iowa State University Extension and Outreach beef specialist. “In summer, this can mean heat intolerance and in cold weather, poor circulation can lead to loss of the tips of ears and tails, and reduced ability to withstand cold temperatures.”
Fescue grass contains a similar ergot alkaloid compound, Acremonium coenophialum, which produces the ergot alkaloid ergovaline. Alkaloids from both sources cause the same clinical signs, including reproductive issues.
Because several Iowa herds experienced poor reproduction rates and late-term abortions due to extremely high alkaloid consumption, specialists developed a plan to test for ergot alkaloid concentration by sampling hay and other forages in southwest Iowa.