Figure shows the results of EC in bovine plasma. It has been demonstrated in laboratory animals that orally administered EC is completely and rapidly absorbed from the gatrointestinal tract and evenly distributed in most tissues . The fact that cattle are ruminants and have a "fermentation vat" as part of their digestive tract, it is not known if endogenous EC could be produced within the rumen. The plasma results suggest that plasma levels may be associated to the % of WDGS in the ration. More research and controlled studies are necessary to determine if there is a dose and time-related response to EC absorption and blood levels. It is important to note that EC itself is fairly innocuous as it is readily metabolized to ethanol, CO 2 , and ammonia and these products excreted. It is the cytochrome P450 metabolites of EC, vinyl carbamate and vinyl carbamate epoxide that are toxic to cells . Levels of EC are regulated in food products destined for human consumption, as the compound is listed as a Group 2A carcinogen . This manuscript describes (1) a GC-MS assay for detection and quantification of EC in distillers grains co-products that are commonly used as animal feeds and (2) detection of EC in bovine plasma samples. Our data indicate that EC is found to circulate in bovine blood collected from animals fed with 19 to 38% of CWDGS on an as-fed basis. The hypothesis that was described in the introduction proposes that EC may contribute to AIP -the work presented here does neither confirms nor refutes this hypothesis, but does suggest that EC is circulating at levels sufficiently high that further research into the relationship between EC and AIP is warranted for animals consuming feed supplemented with appreciable amounts of distillers grains co-products.