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Experimental plan showing number of silos per treatment (N = 78). Formic acid (85%): 3 ml per kg grass; Lactic acid bacteria: 8 × 108 per kg grass.
| Additive | L.m.* contaminated | Storage period (days) | 200 gDM/kg | 430 gDM/kg | 540 gDM/kg | |||
| Water lock | Capillary tube | Water lock | Capillary tube | Water lock | Capillary tube | |||
| No | 90 | 3 | 3 | 3 | 3 | 3 | 3 | |
| additive | X | 30 | 3 | 3 | 3 | 3 | 3 | 3 |
| (0) | X | 90 | 3 | 3 | 3 | 3 | 3 | 3 |
| Formic acid | X | 30 | 3 | 3 | ||||
| (FA) | X | 90 | 3 | 3 | ||||
| Lactic acid | X | 30 | 3 | 3 | ||||
| bacteria (LAB) | X | 90 | 3 | 3 | ||||
*: L.m. = Listeria monocytogenes.
