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Prevalence of mastitogenic pathogens in pasture and total mixed ration based dairies during 2008 and 2013
Dissertation (MMedVet)--University of Pretoria, 2015.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2016
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| _version_ | 1867613486581809152 |
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| access_status_str | Open Access |
| author2 | Petzer, Inge-Marie |
| author_browse | Petzer, Inge-Marie |
| author_facet | Petzer, Inge-Marie |
| collection | Thesis |
| dc_rights_str_mv | © 2016 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MMedVet)--University of Pretoria, 2015. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/53317 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:36:55.109Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/53317 Prevalence of mastitogenic pathogens in pasture and total mixed ration based dairies during 2008 and 2013 Petzer, Inge-Marie dawie.blignaut@up.ac.za Thompson, P.N. (Peter N.) Blignaut, David J.C. UCTD Veterinary science theses SDG-01 Veterinary science theses SDG-12 Dissertation (MMedVet)--University of Pretoria, 2015. Mastitis is one of the most economically important diseases in dairy cattle worldwide. Not only does it have a negative effect on milk production, it also is one of the main reasons for culling dairy cattle. Pathogens causing mastitis in dairy cattle can be grouped into either contagious (or host adapted) or environmental pathogens. In different parts of the world it was shown that the prevalence of these differently grouped pathogens is dependent on various risk factors. Furthermore, it was shown that control measures implemented against contagious intramammary infections caused a relative shift over time towards a higher prevalence of environmental intramammary infections. In this study udder health data from the Onderstepoort Milk Laboratory (OML) was compared over two different years, 2008 and 2013, with regards to the prevalence of specified mastitogenic pathogens in total mixed ration (TMR) dairies and pasture-based dairies. Furthermore, the within-herd prevalence of Streptococcus uberis (Str. uberis) in Str. uberis positive herds was compared between the two years and the two management systems. Statistically significant differences were found in the prevalence of most of the major contagious and environmental mastitogenic pathogens between 2008 and 2013 and between the TMR and pasture-based dairies. Coagulase-negative staphylococci (CNS) has the highest prevalence in both TMR and pasture-based for both 2008 and 2013. Streptococcus uberis overall showed an increase in prevalence from 2008 to 2013, with the highest prevalence in pasture-based dairies in 2013. Staphylococcus aureus (S. aureus) showed a statistically significant decrease in TMR and pasture-based dairies from 2008 to 2013. The within-herd prevalence of Str. uberis increased from 2008 to 2013 with the highest within-herd prevalence in pasture-based dairies in 2013. tm2016 es2025 Production Animal Studies MMedVet SDG-01: No poverty SDG-12: Responsible consumption and production 2016-06-22T08:00:46Z 2016-06-22T08:00:46Z 2016-04-21 2015 Dissertation Blignaut, DJ 2015, Prevalence of mastitogenic pathogens in pasture and total mixed ration based dairies during 2008 and 2013, MMedVet Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/53317> A2016 http://hdl.handle.net/2263/53317 en © 2016 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Veterinary science theses SDG-01 Veterinary science theses SDG-12 Prevalence of mastitogenic pathogens in pasture and total mixed ration based dairies during 2008 and 2013 |
| title | Prevalence of mastitogenic pathogens in pasture and total mixed ration based dairies during 2008 and 2013 |
| title_full | Prevalence of mastitogenic pathogens in pasture and total mixed ration based dairies during 2008 and 2013 |
| title_fullStr | Prevalence of mastitogenic pathogens in pasture and total mixed ration based dairies during 2008 and 2013 |
| title_full_unstemmed | Prevalence of mastitogenic pathogens in pasture and total mixed ration based dairies during 2008 and 2013 |
| title_short | Prevalence of mastitogenic pathogens in pasture and total mixed ration based dairies during 2008 and 2013 |
| title_sort | prevalence of mastitogenic pathogens in pasture and total mixed ration based dairies during 2008 and 2013 |
| topic | UCTD Veterinary science theses SDG-01 Veterinary science theses SDG-12 |
| url | http://hdl.handle.net/2263/53317 |