The role of animal movement, including off-farm rearing of heifers, in the interherd transmission of multidrug-resistant Salmonella

Adhikari, B., Besser, T. E., Gay, J. M., Fox, L. K., Davis, M. A., Cobbold, R. N., Berge, A. C. B. and Hancock, D. D. (2009) The role of animal movement, including off-farm rearing of heifers, in the interherd transmission of multidrug-resistant Salmonella. Journal of Dairy Science, 92 9: 4229-4238. doi:10.3168/jds.2008-1494


Author Adhikari, B.
Besser, T. E.
Gay, J. M.
Fox, L. K.
Davis, M. A.
Cobbold, R. N.
Berge, A. C. B.
Hancock, D. D.
Title The role of animal movement, including off-farm rearing of heifers, in the interherd transmission of multidrug-resistant Salmonella
Formatted title
The role of animal movement, including off-farm rearing of heifers, in the interherd transmission of multidrug-resistant Salmonella
Journal name Journal of Dairy Science   Check publisher's open access policy
ISSN 0022-0302
1525-3198
Publication date 2009-09
Sub-type Article (original research)
DOI 10.3168/jds.2008-1494
Volume 92
Issue 9
Start page 4229
End page 4238
Total pages 10
Place of publication New York, United States
Publisher Elsevier
Language eng
Formatted abstract
Fifty-nine commercial dairy farms were sampled 7 times over 15 to 21 mo to determine the role of animal movement, including off-farm rearing of heifers, in the interherd transmission of multidrug-resistant (MDR) Salmonella spp. Farm management data were collected by on-site inspections and questionnaires on herd management practices before and after the study. Forty-four percent (26/59) of herds did not acquire any new MDR Salmonella strains. The number of newly introduced MDR Salmonella strains acquired by the remaining 56% (33/59) of herds ranged from 1 to 8. Logistic regression models indicated that off-farm heifer raising, including contract heifer raising where heifers commingle with cattle from other farms [commingled heifers, odds ratio (OR) = 8.9, 95% confidence interval (CI): 2.4, 32.80], and herd size per 100-animal increment (herd size, OR = 1.04, 95% CI, 1.01, 1.05) were significantly associated with the introduction of new MDR Salmonella strains. The negative binomial regression similarly revealed that commingled heifers [relative risk (RR) = 2.3, 95% CI: 1.1, 4.7], herd size per 100 animals (RR = 1.02, 95% CI, 1.01, 1.03), and a history of clinical salmonellosis diagnosed before the study (RR = 2.5, 95% CI, 1.3, 5.0) were significantly associated with the number of new MDR Salmonella strains that were introduced. Factors not associated with the introduction of new MDR Salmonella strains were housing of heifers and cows in the same close-up pen, a common hospital-maternity pen, and the number of purchased cattle. This study highlights the role of animal movement in the interherd transmission of MDR Salmonella spp.
© American Dairy Science Association, 2009.
Keyword Multidrug-resistant Salmonella
Dairy farm
Herd-level risk factor
Dairy herds
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Veterinary Science Publications
 
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Created: Fri, 04 Sep 2009, 10:21:21 EST