Since there are no data on the apparent ileal digestibility (AID) or the standardized ileal digestibility (SID) of amino acids (AA) in sorghum (S-DDGS) or in blends of sorghum and corn DDGS (SC-DDGS). Therefore, the objective of this experiment was to measure the AID and SID of AA in S-DDGS and SC-DDGS and compare these values to the SID of AA in C-DDGS. It was found that the digestibility of CP and Lys in S-DDGS and SC-DDGS is similar to values obtained for
C-DDGS, but many of the remaining AA are less digestible in S-DDGS and SC-DDGS than in C-DDGS. The concentration and digestibility of AA in C-DDGS varies among ethanol plants, which impedes the prediction of the concentration of digestible AA from the concentration of total AA.

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