In order to assess Salmonella dynamics in a poultry production setting, two studies were conducted to evaluate how common environmental factors during production influence Salmonella populations in poultry litter. A field study was initially conducted to determine Salmonella prevalence, populations, serotypes, and antibiotic resistance in fresh excreta and litter from commercial North Carolina broiler farms. Litter pH, temperature, ammonia levels, moisture content, and water activity (A<sub>w</sub>) were also measured. The purpose of this field study was to assess the populations and prevalence of Salmonella present during grow-out along with how varying environmental growth parameters and management practices impact its growth, persistence and true risk for consumers. Field data were subsequently used to design a laboratory study that observed the combined effects of pH and A<sub>w</sub> at a constant temperature on the growth and decline of Salmonella spp. in inoculated litter for the purpose of predicting microbial behavior using statistical modeling. By understanding the growth and death kinetics of Salmonella based on environmental factors found normally during poultry production, production management strategies can be developed to reduce Salmonella populations on birds entering processing plants, thereby reducing the risk of foodborne illness for consumers.
| Identifer | oai:union.ndltd.org:NCSU/oai:NCSU:etd-07142005-161524 |
| Date | 20 July 2005 |
| Creators | Payne, Joshua Bill |
| Contributors | Brian Sheldon, Brian Sheldon, Brian Sheldon |
| Publisher | NCSU |
| Source Sets | North Carolina State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://www.lib.ncsu.edu/theses/available/etd-07142005-161524/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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