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Incidence of Listeria species in feed of dairy cows.
| Type of feed | Listeria spp. n (%) | L. monocytogenes n (%) |
|---|---|---|
| Grass (n = 14) | Not detected | Not detected |
| Silage (n = 48) | 4 (3.1) | 6 (4.7) |
| Haylage (n = 16) | 2 (1.5) | 2 (1.5) |
| Hay (n = 10) | Not detected | 2 (1.5) |
| Feed concentrates (n = 32) | Not detected | 12 (9.3) |
| Mixed fodder prepared in the farm (n = 4) | 2 (1.5) | 2 (1.5) |
| Straw ( n = 6) | 4 (3.1) | 2 (1.5) |
| Total (n = 130) | 12 (9.2) | 26 (20.0) |
