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PATHOGEN IDENTIFICATION AND INCIDENCE RATES OF CLINICAL MASTITIS ON ORGANIC AND CONVENTIONAL DAIRY FARMS

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dc.contributor.advisor DeVries, Trevor
dc.contributor.author Levison, Lena
dc.date.accessioned 2013-03-11T15:40:57Z
dc.date.available 2013-03-11T15:40:57Z
dc.date.copyright 2013-02
dc.date.created 2013-02-15
dc.date.issued 2013-03-11
dc.identifier.uri http://hdl.handle.net/10214/5790
dc.description.abstract Thesis objectives were: 1) evaluate incidence rate of producer reported clinical mastitis (IRCM) and predominant pathogen types on conventional and organic dairies; 2) investigate associations between farm type, housing and access to pasture and IRCM; 3) explore association between bulk tank somatic cell count (BTSCC) and IRCM. An investigation on 59 dairy farms in Southern Ontario, Canada, involving organic and conventional management systems was conducted from April 2011 to March 2012. Coagulase-negative staphylococci were the most frequent pathogens (20.4%); Staphylococcus aureus was the most common contagious pathogen (9.6%). The overall mean IRCM was 24.7 cases/100 cow-years. Organic farms tended to have lower IRCM than conventional farms (17.1 cases/100 cow-years vs. 28.1 cases/100 cow-years). In summary, mean IRCM tended to be lower in the organic compared to conventionally managed herds. Housing, pasture use, and BTSCC category were not associated with overall IRCM; however, these factors did impact pathogen-specific IRCM. en_US
dc.language.iso en en_US
dc.title PATHOGEN IDENTIFICATION AND INCIDENCE RATES OF CLINICAL MASTITIS ON ORGANIC AND CONVENTIONAL DAIRY FARMS en_US
dc.type Thesis en_US
dc.degree.programme Animal and Poultry Science en_US
dc.degree.name Master of Science en_US
dc.degree.department Department of Animal and Poultry Science en_US
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