The impact of respiratory disease on production in the pig industry in Great Britain
Evans, Charlotte Marie (2010) The impact of respiratory disease on production in the pig industry in Great Britain. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2338639~S15
This thesis presents research on the epidemiology of respiratory
herds in GB
and their impact
on pig morbidity and mortality.
management, characteristics of the
herd, presence of multiple pathogens and
control and elimination strategies were considered.
Questionnaires were completed
veterinarians that attended 116 pig
GB. Pathogens were clustered on
suggesting similar risk
for infection /
persistence. Management factors
investigated for their
association with the within and between-herd variability
pig antibodies to
porcine reproductive and respiratory syndrome virus
(PRRSV) in 103 pig
to other pig
sows and not
purchased stock or not
isolating for long
Considering the possible
fade out of
PRRSV, the within-herd transmission
investigated using a mathematical model.
There was a high
in breeding pigs
before virus reached young stock and
increased persistence in
in large herds, herds with
between age groups and herds that had frequent re-introduction of virus.
provided evidence for
within and between
models were also used to
the range of
and to test strategies for
control and elimination.
difficult to eliminate without
targeting both rearing pigs and sows.
vaccination of sows once there was an
spread of virus
is low it
be possible to control
In larger herds in
regions elimination might
and control might give more stability.
long-term benefits of elimination will
within and outside the herd but
production might not
be observed unless several respiratory pathogens are eliminated
|Item Type:||Thesis or Dissertation (PhD)|
|Subjects:||Q Science > QL Zoology|
|Library of Congress Subject Headings (LCSH):||Respiratory organs -- Diseases -- Epidemiology, Porcine reproductive and respiratory syndrome, Swine -- Diseases -- Epidemiology, Swine -- Diseases -- Mathematical models, Swine -- Productivity|
|Official Date:||February 2010|
|Institution:||University of Warwick|
|Theses Department:||Department of Biological Sciences|
|Supervisor(s)/Advisor:||Green, Laura E. ; Medley, Graham|
|Sponsors:||Great Britain. Dept. for Environment, Food & Rural Affairs (DEFRA) ; Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC) ; British Pig Executive (BPEX)|
|Extent:||xvii, 162 leaves : ill., charts|
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