AFAB

Keywords: conventional poultry feed, organic poultry feed, Salmonella, storage temperature, water activity

Abstract:

The objective of this study was to compare the ability of Salmonella to survive in organic and conventional broiler feeds as affected by temperature (11, 25, and 38°C), water activity (aw 0.75, 0.55, and 0.43) and storage time (up to 80 days). Feeds were inoculated with a mixture of \ve Salmonella serotypes at high and low populations (6 and 3 log CFU/g, respectively), and populations and presence (by enrichment) were monitored over time.Although the number of Salmonella in organic feed for the majority of temperature-by-aw combinations was significantly lower (P ≤ 0.05) compared to the number in conventional feed over the 80-day storage period, differences in mean populations were less than 1 log CFU/g.The odds-ratio (OR) for presence of Salmonella was significantly higher (P ≤ 0.05) in conventional feed than in organic feed containing high and low inocula (OR = 4.76 and 2.92, respectively). Based on these findings, we generally conclude that there were no biologically significant differences in survival of Salmonella in organic and conventional poultry feeds.

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