Herd-level risk factors for chronic pleurisy in finishing pigs: a case-control study

Abstract Background Chronic pleuritis is a common finding in slaughtered pigs in post-mortem meat inspection. The prevalence of pleuritis has been increasing during the last decade also in Finland. The aim of this prospective case-control study was to search for environmental, infectious and management-related herd-level risk factors for pleuritis in the slaughterhouse. Altogether 46 Finnish pig herds, including 25 control (low pleuritis prevalence in meat inspection) and 21 case (high pleuritis) herds, were enrolled in the study and visited during the tenth week of the rearing period of finishing pigs. Herd personnel were asked about basic herd information, management and environmental factors. Selected pigs were examined clinically, environmental parameters were measured and 15 blood samples per herd were taken during herd visits. Antibodies against Actinobacillus pleuropneumonia serotype 2 (APP2) and ApxIV toxin and swine influenza virus were measured. After the slaughter of study pigs, meat inspection results of the batch were gathered from slaughterhouses. Multivariate logistic regression models were built to identify possible risk factors for a herd to be a case herd ( i.e. having high pleuritis values).Results Finishing herd type, herd size and APP2 seropositivity were observed to act as risk factors. In addition to these, general herd-level factors, flank biting and high APP2 antibody prevalence of the herd tended to be associated with the risk of the herd being a case herd. None of the other clinical signs of pigs, management-related factors or environmental measurements were associated with herd status.Conclusions As previously known, in endemic and subclinical infections such as APP, herd and management-related factors are important in building up infection pressure, but single risk factors seem to be difficult to identify. However, as flank biting was more common in high pleuritis herds, part of disease susceptibility is likely mediated via stress.

Download Full-text

Herd-level risk factors for chronic pleurisy in finishing pigs: a case-control study

10.21203/rs.3.rs-21706/v2 ◽

2020 ◽

Author(s):

Outi Hälli ◽

Minna Haimi-Hakala ◽

Claudio Oliviero ◽

Mari Heinonen

Keyword(s):

Risk Factors ◽

Case Control Study ◽

Swine Influenza Virus ◽

Clinical Signs ◽

Case Control ◽

Meat Inspection ◽

Common Finding ◽

Finishing Pigs ◽

Herd Level ◽

Control Study

Abstract Background Chronic pleurisy is a common finding in slaughtered pigs in post-mortem meat inspection. The prevalence of pleurisy has been increasing during the last decade also in Finland. The aim of this prospective case-control study was to search for environmental, infectious and management-related herd-level risk factors for pleurisy in the slaughterhouse. Altogether 46 Finnish pig herds, including 25 control (low pleurisy prevalence in meat inspection) and 21 case (high pleurisy) herds, were enrolled in the study and visited during the tenth week of the rearing period of finishing pigs. Herd personnel were asked about basic herd information, management and environmental factors. Selected pigs were examined clinically, environmental parameters were measured and 15 blood samples per herd were taken during herd visits. Antibodies against Actinobacillus pleuropneumonia serotype 2 (APP2) and ApxIV toxin and swine influenza virus were measured. After the slaughter of study pigs, meat inspection results of the batch were gathered from slaughterhouses. Multivariate logistic regression model was built to identify possible risk factors for a herd to be a case herd (i.e. having high pleurisy values). Results Finishing herd type and herd size were observed to act as risk factors. None of clinical signs of pigs, management-related factors or environmental measurements were associated with herd status. Conclusions As previously known, in endemic and subclinical infections such as APP, herd factors are important, but detailed risk factors seem to be difficult to identify.

Download Full-text

Case-control study to determine herd-level risk factors for bovine respiratory disease in nursing beef calves on cow-calf operations

Journal of the American Veterinary Medical Association ◽

10.2460/javma.252.8.989 ◽

2018 ◽

Vol 252 (8) ◽

pp. 989-994 ◽

Cited By ~ 4

Author(s):

Amelia R. Woolums ◽

Roy D. Berghaus ◽

David R. Smith ◽

Russell F. Daly ◽

Gerald L. Stokka ◽

...

Keyword(s):

Risk Factors ◽

Respiratory Disease ◽

Case Control Study ◽

Bovine Respiratory Disease ◽

Case Control ◽

Beef Calves ◽

Herd Level ◽

Cow Calf ◽

Control Study

Download Full-text

Herd-level risk factors for bovine tuberculosis and adoption of related biosecurity measures in Northern Ireland: A case-control study

The Veterinary Journal ◽

10.1016/j.tvjl.2016.03.021 ◽

2016 ◽

Vol 213 ◽

pp. 26-32 ◽

Cited By ~ 16

Author(s):

M.J.H. O'Hagan ◽

D.I. Matthews ◽

C. Laird ◽

S.W.J. McDowell

Keyword(s):

Risk Factors ◽

Northern Ireland ◽

Bovine Tuberculosis ◽

Case Control Study ◽

Case Control ◽

Herd Level ◽

Control Study

Download Full-text

A case-control study to identify risk factors for acute salmonellosis in New Zealand dairy herds, 2011–2012

Epidemiology and Infection ◽

10.1017/s095026881600042x ◽

2016 ◽

Vol 144 (10) ◽

pp. 2154-2164

Author(s):

M. A. STEVENSON ◽

P. L. MORGAN ◽

J. SANHUEZA ◽

G. E. OAKLEY ◽

R. S. BATEMAN ◽

...

Keyword(s):

Risk Factors ◽

New Zealand ◽

Case Control Study ◽

Multivariable Analysis ◽

Palm Kernel ◽

Case Control ◽

Dairy Herds ◽

Herd Level ◽

Supplementary Feed ◽

Control Study

SUMMARYIn late 2011 the New Zealand Ministry for Primary Industries reported an increase in confirmed laboratory diagnoses of salmonellosis in dairy herds. To identify risk factors for herd-level outbreaks of salmonellosis we conducted a case-control study of New Zealand dairy herds in 2011–2012. In a multivariable analysis, use of continuous feed troughs [adjusted odds ratio (aOR) 6·2, 95% confidence interval (CI) 2·0–20], use of pelletized magnesium supplements (aOR 10, 95% CI 3·3–33) and use of palm kernel meal as a supplementary feed (aOR 8·7, 95% CI 2·5–30) were positively associated with a herd-level outbreak of salmonellosis between 1 July 2011 and 31 January 2012. We conclude that supplementary feeds used on dairy farms (regardless of type) need to be stored and handled appropriately to reduce the likelihood of bacterial contamination, particularly from birds and rodents. Magnesium supplementation in the pelletized form played a role in triggering outbreaks of acute salmonellosis in New Zealand dairy herds in 2011–2012.

Download Full-text