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An Epidemiological Investigation of Avian Reovirus Among Commercial Broiler Chicken Flocks in Ontario

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dc.contributor.advisor Guerin, Michele
dc.contributor.author Nham, Eric
dc.date.accessioned 2014-01-06T20:32:19Z
dc.date.available 2014-01-06T20:32:19Z
dc.date.copyright 2013-12
dc.date.created 2013-12-13
dc.date.issued 2014-01-06
dc.identifier.uri http://hdl.handle.net/10214/7758
dc.description.abstract An Epidemiological Investigation of Avian Reovirus Among Commercial Broiler Chicken Flocks in Ontario. This thesis is an investigation of prevalence, geographical distribution, and seasonal variation, and risk factors of avian reovirus (ARV)among commercial broiler chicken flocks in Ontario. Avian reovirus prevalence in the study population was 90.5%(95%confidence interval:86.8 to94.3%. Using univariable logistic regression models, statistically significant associations were identified between ARV presence and geographic district ( p = 0.012). There was no association between flock mortality and flock ELISA mean titre or PCR status. In the multivariable linearregression model and multi-level logistic regression model with flock as a random effect, co-infection with chicken anemia virus was associated with an increased risk of ARV infection. The season of grow- out was associated with the ARV mean titre, with significantly lower titres in the winter compared to the spring, summer, and autumn. Differences in ARV mean titres affiliated with feed mills supplying feed to the flocks were also identified. en_US
dc.description.sponsorship The Ontario Ministry of Agriculture, Food and Rural Affairs (OMAFRA) / University of Guelph Partnership, OMAFRA-University of Guelph Agreement through the Animal Health Strategic Investment (AHSI) fund managed by the Animal Health Laboratory of the University of Guelph, the Poultry Industry Council, and the Chicken Farmers of Ontario. en_US
dc.language.iso en en_US
dc.subject avian reovirus en_US
dc.subject prevalence en_US
dc.subject distribution en_US
dc.subject epidemiology en_US
dc.subject season en_US
dc.subject risk factors en_US
dc.subject broiler chickens en_US
dc.subject PCR en_US
dc.subject ELISA en_US
dc.subject barn management en_US
dc.subject biosecurity en_US
dc.title An Epidemiological Investigation of Avian Reovirus Among Commercial Broiler Chicken Flocks in Ontario en_US
dc.type Thesis en_US
dc.degree.programme Population Medicine en_US
dc.degree.name Master of Science en_US
dc.degree.department Department of Population Medicine en_US
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