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Herd-level determinants of bovine leukaemia virus prevalence in dairy farms

Published online by Cambridge University Press:  11 September 2012

Ronald J Erskine ,
Paul C Bartlett ,
Todd M Byrem ,
Chelsea L Render ,
Catherine Febvay  and
Jessica T Houseman
Ronald J Erskine*
Affiliation:
Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, MI 48824, USA
Paul C Bartlett
Affiliation:
Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, MI 48824, USA
Todd M Byrem
Affiliation:
AntelBioSytems, Inc., Lansing, MI 48909, USA
Chelsea L Render
Affiliation:
Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, MI 48824, USA
Catherine Febvay
Affiliation:
Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, MI 48824, USA
Jessica T Houseman
Affiliation:
AntelBioSytems, Inc., Lansing, MI 48909, USA
*
*For correspondence; e-mail: [email protected]
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Abstract

The prevalence of bovine leukaemia virus (BLV) was determined in 113 Michigan dairy herds by ELISA testing for anti-BLV antibodies in milk. Additionally, an interview regarding management practices with cooperating herd managers identified farm-level variables thought to be associated with prevalence of BLV. Twenty-three risk factors (P ⩽ 0·1) were identified on one-way ANOVA or simple linear regression. Multivariate analysis identified several management practices whose predictive value for increased prevalence of BLV may relate to transmission among herd mates, e.g. reuse of hypodermic needles, lack of fly control, gouge dehorning and increased use of injections in dry cows. Additionally, exclusive breeding of heifers with artificial insemination was associated with decreased BLV prevalence, as compared with at least some use of natural service by a bull. Although intervention studies are needed before causal relationships can be concluded, and unaccounted variables related to transmission exist among dairy herds, these findings suggest management practices that may help dairy producers reduce the transmission of BLV within their herds.

Keywords

Bovine leukosisherd determinantsprevalence
Type
Research Article
Information
Journal of Dairy Research , Volume 79 , Issue 4 , November 2012 , pp. 445 - 450
Copyright
Copyright © Proprietors of Journal of Dairy Research 2012

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