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Prevalence of Salmonella in litter of 4 sequential flocks of broiler chickens administered probiotics or prebiotics and reared in research housing.
| Flock | Control | All-Lac | All-Lac + BioMos | Aviguard | Primalac |
|---|---|---|---|---|---|
| 1 | + | - | - | + | - |
| 2 | + | + | - | - | - |
| 3 | - | + | - | + | - |
| 4 | - | + | + | + | - |
