Green fodder preservation consists of protecting the nutrients quantitatively and qualitatively over a longer period of time by inactivating microbial and feed-specific enzymes from decomposition processes, ie autolysis, oxidation, hydrolysis and microbial degradation, minimizing enrichment with undesirable substances or metabolites and destruction of the nutrient structure only to an unavoidable or desirable extent. Research activities deal with the preservation of various feed substrates for fermented feed (grass and corn silage, fermented hay) and hay. In the area of ​​fermented feed, additives (silage aids) are tested for their effectiveness to improve the fermentation process or to ensure aerobic stability. In addition, we deal with aspects of preservation technology from forage harvesting, ensiling, hay ventilation and storage to fodder removal as well as losses in the process chain.