Yes, careful use of covers during storage and feedout stages can significantly extend the useful life of silage. Silage is always vulnerable to quality loss and spoilage triggered by the presence of oxygen. Carefully sealed silage, including in silo bags and bales, can theoretically be stored for several years,
Exceptionally long storage periods for silage depends on near perfect moisture levels and ideal packing at ensiling, as well as careful management during the fermentation process. If silage of this excellent quality is then maintained in completely airtight conditions, there is no definitive expiration date, just like those homemade pickles in your grandmother's cellar.
