Herd-level factors associated with isolation of Salmonella in a multi-state study of conventional and organic dairy farms. II. Salmonella shedding in calves

C. P. Fossler, S. J. Wells, J. B. Kaneene, P. L. Ruegg, L. D. Warnick, J. B. Bender, L. E. Eberly, S. M. Godden, L. W. Halbert

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

The objective of this study was to evaluate associations between herd-level factors and the isolation of Salmonella in calves from dairy farms in Minnesota, Wisconsin, Michigan and New York. Study farms were 129 conventional and organic farms enrolled without regard to previous history of Salmonella infection. Herds were sampled at 2-month intervals over a 1-year period. Salmonella was isolated in fecal samples from 176 (3.8%) of 4673 preweaned calves with 40 (31.0%) of 129 farms having at least one positive calf sample over the course of the study. Multivariable logistic regression using the generalized estimating equations approach was used to evaluate risk factors for Salmonella shedding after adjustment for effects of herd size, season, state of origin and the multiple sampling occasions per herd. Factors retained in the final model that were associated with an increased odds for Salmonella shedding were lack of routine feeding of milk replacer containing antimicrobials to preweaned calves (OR = 2.8, 95% CI: 1.4, 5.8), use of maternity housing as a hospital area for sick cows more than once a month (OR = 2.1, 95% CI: 1.1, 4.0), and cow prevalence level by visit, categorized into the following four-levels: ≥20% (OR = 11.6, 95% CI: 5.7, 23.7), 10-19.9% (OR = 4.7, 95% CI: 2.0, 11.5), 0.1-9.9% (OR = 3.6, 95% CI: 1.5, 8.7) and 0% (reference level). Herd size was not associated with Salmonella shedding in the final multivariable model.

Original languageEnglish (US)
Pages (from-to)279-291
Number of pages13
JournalPreventive Veterinary Medicine
Volume70
Issue number3-4
DOIs
StatePublished - Sep 12 2005

Bibliographical note

Funding Information:
Supported by USDA/CSREES National Research Initiative (Epidemiological Approaches to Food Safety) award number 99-35212-8563, The Population Medicine Center at Michigan State University, and the Center for Animal Health and Food Safety at the University of Minnesota. The authors thank Katie May and RoseAnn Miller of the Population Medicine Center at Michigan State University for their technical support.

Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.

Keywords

  • Dairy calves
  • Dairy cattle
  • Herd-level risk factors
  • Organic
  • Salmonella

Fingerprint Dive into the research topics of 'Herd-level factors associated with isolation of Salmonella in a multi-state study of conventional and organic dairy farms. II. Salmonella shedding in calves'. Together they form a unique fingerprint.

Cite this