June 9, 2009
US feed group recommends analytic tests on DDGS
The American Feed Industry Association in cooperation with two other organisations has conducted an evaluation to reduce variation in dried distillers'' grains with soluble (DDGS) analysis.
A number of analytical methods for constituents commonly measured in DDGS are practiced in laboratories.
A large interlaboratory variability among results has been observed in the industry. Methods for moisture, crude fat, and crude fibre are experimental hence variability can be attributed to the use of different methods of analysis.
AFIA, together with the Renewable Fuels Association (RFA) and the National Corn Grain Association (NCGA) have also evaluated the efficacy, applicability, and the intralaboratory variation of a number of methods for moisture, crude protein, crude fat, and crude fibre in DDG with solubles (DDGS).
A second study was undertaken to assess existing interlaboratory variation of the same methods in 23 laboratories.
Based on the results of these studies, the sponsoring associations established recommended reference methods for use in commercial trade of DDGS (see table).
Constituent
Studied methods
Recommended method
Moisture
AOAC1930.15,
NFTA 2.2.2.5
AOAC 934.01,
AOAC 935.29,
AOAC 2003.06,
NFTA22.2.2.5
Crude protein
AOAC 990.03
AOAC 990.03
AOAC 2001.13
AOAC 2001.11
Crude fat
AOAC 945.16,
AOAC 945.16
AOAC 954.02,
AOAC 2003.05,
AOAC 2006.06
Crude fibre
AOAC 978.10
AOAC 978.10
AOCS3Ba 6a-05
1 Association of Official Agricultural Chemists
2 National Forage Testing Association
3 American Oil Chemist''s Society
The recommendations are based on inter-laboratory studies in which Denmark-based analytical solutions provider Foss was involved, participating in the trials and supplying analytical solutions.