The invention provides the isolated microorganism strains Lactobacillus buchneri BioCC 203 DSM 32650 and Lactobacillus buchneri BioCC 228 DSM 32651 and their use as microbiological feed additives. The strains are used for ensuring aerobic stability of feed with low dry matter content (≤ 20 percentage) and improving fermentation of feed, for increasing the concentration of lactic and acetic acids in feed and for reducing pH, hence decreasing the loss of nutrients in feed. Usage of the microorganisms in ensiling suppresses the function of pathogenic microorganisms (enteropathogens) and yeasts in feed. The strains can be used for prolonging the storage life of feed made from fresh material difficult to ferment.
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