Distillers Grains Co-products. Corn wet distillers grains with solubles (CWDGS), corn dry distillers grains with solubles (CDDGS), corn condensed distillers solubles, syrup (CCDS), and milo wet distillers grains with solubles (MWDGS) samples were collected from various Midwest ethanol plants and different feedyards during the fall of 2018. The details on collection period, post-manufacture residence days, and number of ethanol plant sources can be found in supplementary Table . Five samples were randomly chosen from each sample type to be assayed. Samples are only labeled 1-5 to protect the identity of the source. One liquid feed sample (LF) was acquired at a Midwest feed manufacturer and contained approx. 20% cane molasses, 20% CCDS, 20% Urea, minerals and other components. All grain and liquid samples were stored at -80°C until assayed.