Two different silage cover films, one made of standard polyethylene (PE) and the other made of Mater-Bi® biodegradable plastic (MB), with two different thicknesses (60 and 120 μm) have been compared. A whole maize crop was chopped, treated with a mixture of Lactobacillus plantarum, L. buchneri, and Enterococcus faecium, and ensiled in plastic bags with four replications for each treatment. After 55 and 110 d of conservation, all the silages were well fermented with no differences in fermentative and nutritional quality between the treatments, and few differences in mould count and aerobic stability after 110 d of conservation. These results showed the possibility of successfully developing a biodegradable cover for silage for 4 months after ensiling
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