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BACKGROUND: The objective of this study was to compare the fermentation variables of laboratory‐scale silages made in glass preserving jars (GLASS) and vacuum‐packed plastic bags (Rostock model silages, ROMOS). Silages were prepared from perennial ryegrass (fresh and wilted, 151 g kg⁻¹ and 286 g kg⁻¹ dry matter (DM), respectively) and remoistened coarsely ground rye grain (650 g kg⁻¹ DM) either with or without the addition of a lactic acid bacteria inoculant (3 × 10⁵ colony forming units (cfu) g⁻¹, LAB). Quintuplicate silos were opened on days 2, 4, 8, 49 and 90.

RESULTS: Silage pH (P = 0.073), acetic acid content (P = 0.608) and ethanol content (P = 0.223) were not influenced by the ensiling method. The contents of DM (P < 0.001) and propionic acid (P = 0.008) were affected by the ensiling method, but mean differences were only marginal. In ROMOS the concentration of lactic acid was increased …