UMD Theses and Dissertations

Permanent URI for this collectionhttp://hdl.handle.net/1903/3

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a given thesis/dissertation in DRUM.

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Author: search.filters.author.Almario, Jose Alejandro NavarroSubject: search.filters.subject.egg

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    Prevalence of Salmonella on Laying Hen Farms and Control of Colonization in Poultry Through Egg Yolk Antibodies
    (2014) Almario, Jose Alejandro Navarro; Biswas, Debabrata; Animal Sciences; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    In the United States, rates of foodborne illness caused by Salmonella have not changed significantly. One study in this thesis estimated Salmonella prevalence and antimicrobial resistance of various samples from conventional (n=181) and organic (n=252) farms. Rates of Salmonella contamination were significantly lower on conventional than organic farms. Antimicrobial resistance was significantly higher on isolates from conventional versus organic farms. These findings suggest that poultry production practices may have significant effects on prevalence and antibiotic resistance patterns of Salmonella. The other study assessed the efficacy of a Salmonella control strategy using anti-Salmonella antibodies, two chicken cell lines, an HD-11 macrophage and a DF-1 fibroblast line, and Salmonella serovars Typhimurium and Enteritidis. In DF-1 cells, treatment showed decrease adherence of the pathogen. However, in HD-11 cells, treatment showed an increase in pathogen adherence, indicating a more detailed understanding of chicken response to treatment with the antibodies is needed before full-scale implementation.