Risk factors for herds to test positive for Mycobacterium avium ssp. paratuberculosis-ani\bod\es with a commercial milk enzyme-linked immunosorbent assay (ELISA) in Ontario and western Canada

Ulrike S. Sorge, Kerry Lissemore, Ann Godkin, Jocelyn Jansen, Steven Hendrick, Scott Wells, David F. Kelton

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The objectives of this study were to identify risk factors associated with i) a Mycobacterium avium subsp. paratuberculosis (MAP)-antibody milk enzyme-linked immunosorbent assay (MAP milk ELISA)-positive herd status, and ii) the within-herd MAP milk ELISA-positive prevalence in Canadian dairy herds. This prospective cohort study was conducted between 2005 and 2009 on 226 herds in Ontario and western Canada, which participated in a voluntary risk assessment (RA)-based Johne's disease control program. Two MAP milk ELISA and risk assessments and a previsit survey were available per herd. The overall farm RA scores alone could not be used to predict whether a herd would test positive for MAP antibodies. However, the results of this study indicated that increasing the likelihood of exposing calves to MAP through certain management practices, as assessed with the RA, increased the likelihood of a herd being test-positive for MAP antibodies.

Original languageEnglish (US)
Pages (from-to)963-970
Number of pages8
JournalCanadian Veterinary Journal
Volume53
Issue number9
StatePublished - Sep 2012

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