Silage additives, commonly presented as "silage inoculant" or "silage preservative", are technological feed additives used for silage conservation, especially thanks to a deeper and faster acidification of the forages, and to an improvement of aerobic stability once the silo opened. Standard evaluation of the silage inoculant effects in the European Union relies on microsilos tests, modeling standard silos at the laboratory scale. Results presented here shows the effects of two products, NOLISIL HL100 for grass and legume silages, and NOLISIL MC100 for maize and whole crop cereal silage. A stronger acidification was demonstrated on ray grass and alfalfa silage with the NOLISIL HL100 (-0,5 pH after 2-3 days on average). Maize silage trials demonstrated a better aerobic stability with NOLISIL MC100 (with 4 days more than the negative control without heating on average) after only 32 days and 45 days of fermentation.
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