Maize silage which was freeze-or oven-dried had 0, 2, 4, 6 and 8 % or 0 and 8 % by weight of pure maize starch added, respectively. The samples were analysed for invitro DOMD content at three different laboratories. There were significant differences (P< 0.01) between laboratories and method of sample drying. Higher values were recorded for the freeze-dried material. Nevertheless similar samples were generally ranked in the same order at different laboratories. The increase in in-vitro DOMD values with increasing starch suggests that the technique is able to distinguish between maize silages of varying grain contents. Samples were also analysed for MAD fibre and and their ME content estimated from it and also by the gas production method now widely used in Germany. The gas production method produced higher ME values and these were closer to the results obtained from in-vivo trials.