Abstract: In a method for treating feed silage for ruminants, by which silage is mixed with a microorganism and the mixture of feed silage and microorganism is stored in a closed container for at least 30 days, it is provided that the feed silage is mixed with at least two microorganisms selected from the group consisting of Enterococcus faecium (DSM 3530), Lactobacillus brevis (DSM 19456), Lactobacillus plantarum (DSM 19457), Lactobacillus kefiri (DSM 19455), Trichosporon spec. nov. (DSM 14153), Trichosporon mucoides (DSM 14156), Trichosporon dulcitum (DSM 14162) and Eubacterium (DSM 11798), as well as an inorganic substance having a large internal surface area. In addition, a feed silage additive for ruminants is provided.