Mycotoxin Survey in US: June 2020 Update

Our June 2020 update from the annual Biomin® PROcheck mycotoxin survey comprising 426 samples from 26 states of US corn harvested in 2019, corn by-products, and corn silage is here. Each sample was tested for 6 major mycotoxin groups of,

  • Aflatoxins (Afla): B1, B2, G1, and G2
  • B-Trichothecenes (B-Trich): Deoxynivalenol (DON/Vomitoxin), Acetyl-deoxynivalenol, Nivalenol, Fusarenon X
  • A-Trichothecenes (A-Trich): T-2, HT-2, Neosolaniol, Diacetoxyscirpenol
  • Fumonisins (FUM): B1, B2, B3
  • Zearalenone (ZEN)
  • Ocharatoxin A (OTA)

The survey results represent samples sent in for surveillance testing only and does not include any sample submitted following clinical signs. Below we discuss preliminary trends of each of these feed ingredients regarding mycotoxin prevalence and contamination levels. 

Corn

  • 296 corn samples were tested
  • 96% of samples are positive for at least one mycotoxin vs. 99% in 2018
  • 69% of samples have more than one mycotoxin, vs 72% in 2018
  • Average contamination levels for,

    •  B-Trich: increased to 81% vs 76% in 2018
    • FUM: slightly lowered to 76% vs. 79% in 2018
    • ZEN: at 46% vs. 45% in 2018
    • Afla: reduced to 3% vs. 10% in 2018

  • Overall, the mycotoxin contamination situation seems very similar to 2018.

Corn By-Products

  • 63 corn by-product samples were tested
  • All 100% of samples are positive for at least one mycotoxin vs. 95% in 2018
  • 95% of samples have more than one mycotoxin, vs 90% in 2018
  • Average contamination levels for,

    • B-Trich: increased to 98% vs 94% in 2018
    • FUM: increased to 95% vs. 91% in 2018
    • ZEN: increased to 95% vs. 86% in 2018
    • Afla: increased to 6% vs. 2% in 2018

  • Overall, the mycotoxin contamination levels are relatively higher than 2018.

Corn Silage

  • 67 corn silage samples were tested
  • All 96% of samples are positive for at least one mycotoxin vs. 94% in 2018
  • 51% of samples have more than one mycotoxin, vs 63% in 2018
  • Average contamination levels for,

    • B-Trich: increased to 97% vs 90% in 2018
    • FUM: reduced to 4% vs. 22% in 2018
    • ZEN: reduced to 42% vs. 57% in 2018

  • Overall, B-Trichothecene prevalence levels are increased while FUM and ZEN levels are reduced compared to 2018.