Survival of Salmonella in organic and conventional broiler feed at different temperatures and water activities
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The objective of this project was to compare the survival of Salmonella in organic versus conventional broiler feed stored at different temperatures (11, 25, and 38oC) and water activities (0.75, 0.55, and 0.43) over 80days. Feed samples were inoculated with five Salmonella serotypes at high: 106 and low: 103 CFU/g doses. Salmonella populations (CFU/g) in the feed samples were analyzed quantitatively using direct plating (CFU/g) and qualitatively (enrichment when direct plating was negative). Although Salmonella populations were statistically significantly lower in organic feed for majority of temperature-by-aw over 80 days compared to conventional feed, differences in mean Salmonella populations were less than one log. Odds-ratio (OR) for Salmonella presence in conventional feed was significantly (P<0.05) higher than in organic, for high and low inoculum (OR = 4.76 and 2.92, respectively). Based on these findings, there were no biologically significant reductions in Salmonella populations in organic feed compared to conventional.