As specified in SDSU ExEx 2047 "Feeding Scab-Infected Wheat to Livestock,": agbiopubs.sdstate.edu/articles/ExEx2047.pdf, all classes of beef cattle can tolerate up to 10 ppm vomitoxin in the diet. The wheat as tested could be fed to cattle at the maximum amount recommended level of wheat as is. You don't know what the concentration of vomitoxin is in the screenings, so the recommendation would be to thoroughly mix the screenings, then sample the screenings, and have a representative sample tested for vomitoxin.
