Abstract: A multi-layer barrier film made of a plastic material adapted for covering and/or wrapping natural products used both for animal feeding and as raw materials for plants producing energy from renewable sources, particularly ensiled agricultural vegetable products such as chopped fodder or the like, includes at least one barrier layer made of an air-impermeable, and particularly oxygen-impermeable, plastic material for preventing aerobic fermentation of the ensiled product or for limiting it to the lactic fermentation caused by anaerobic microorganisms. The film has an oxygen permeability value, measured at 0% humidity and at 20° C., not higher than 300 cc/m2/day/atm in the stretched or not stretched condition, with an overall thickness not higher than 500 ?m.