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Cornstalk Grazing Warning: Mycotoxins Can Be a Problem

Cornstalk Grazing Warning: Mycotoxins Can Be a Problem
Mold can be 5-10 worse in the cob and husk than in the grain, says SDSU beef specialist.

Turning beef cattle out on corn stalks might be a problem this year, says Cody Wright, SDSU Extension beef specialist.

"Mycotoxins can be found in different concentrations in different parts of the plant, and in some cases concentrations of deoxynivalenol and fumonisin may be 5-10 times greater in the cob and husk than in the grain," Wright says.

But it's tough to accurately measure mycotoxin levels in corn residue. The best guide in mold levels in the grain.

"If the grain contains less than 1part per million (ppm) deoxynivalenol or zearelenone, or less than 3 ppm fumonisin, it is likely safe to graze," Wright says.

A soon-to-be published Extension Extra will provide information on rates of mycotoxins in beef diets. Ask for it at your county Extension office, or contact Wright directly at (605) 688-5448 or at

Source: SDSU AgBio Communications

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