Using a herd profile to determine age-specific prevalence of bovine leukemia virus in michigan dairy herds.

Veterinary Medicine International
Ronald J ErskineJessica T Houseman

Abstract

Enzootic bovine leukosis is a contagious disease of cattle caused by the retrovirus, bovine leukemia virus (BLV) and is the most common cause of malignant neoplasm in cattle. In order to facilitate surveillance of this disease in dairy herds, we developed a method to combine ELISA of milk collected during routine production testing with a prescribed sampling of cows that is independent of the proportion of cows within each lactation. In 113 Michigan dairy herds, milk samples from ten cows in each of the 1st, 2nd, 3rd, and ≥4th lactations were analyzed for anti-Bovine Leukemia Virus (BLV) antibodies by milk ELISA. For each herd, a BLV herd profile (BHP) was calculated as the simple average of the percent of BLV-positive cows within each of the four lactation groups. The mean BHP for all herds was 32.8%, with means of 18.5, 28.8, 39.2, and 44.8% of 1st, 2nd, 3rd, and ≥4th lactation animals infected, respectively. In eight herds, we determined the correlation between the BHP, and true herd prevalence by testing the entire lactating herd (r = 0.988, P < 0.0001). The BHP allows discrimination of lactation-specific BLV prevalence within a dairy herd, to help identify risk factors and management plans that may be important in transmis...Continue Reading

References

Jul 1, 1982·Annals of Human Genetics·L L Cavalli-Sforza, B Hewlett
Aug 1, 1993·Perception & Psychophysics·J L Miller, S C Wayland
Jul 10, 2009·The Journal of General Virology·Sabrina M RodriguezLeandro R Jones
May 10, 2011·Veterinary Microbiology·Gerónimo GutiérrezKarina Trono

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Citations

Jan 22, 2013·Journal of Dairy Science·P C BartlettR J Erskine
May 26, 2015·Journal of Dairy Science·O A NekoueiG P Keefe
Dec 25, 2017·Journal of Dairy Science·Alessa KuczewskiFrank J U M van der Meer
Sep 12, 2012·The Journal of Dairy Research·Ronald J ErskineJessica T Houseman
Dec 12, 2018·Veterinary Medicine International·Rebecca M LaDronkaPaul C Bartlett
Jan 15, 2019·Journal of Dairy Science·Alessa KuczewskiFrank van der Meer
Jun 27, 2019·Journal of Veterinary Diagnostic Investigation : Official Publication of the American Association of Veterinary Laboratory Diagnosticians, Inc·James F EvermannAmanda L E Bronowski
Jul 26, 2019·Veterinary Medicine International·Vickie J Ruggiero, Paul C Bartlett
Mar 6, 2021·Journal of Dairy Science·Alessa KuczewskiFrank van der Meer
Mar 21, 2021·Journal of Dairy Science·Alessa KuczewskiFrank van der Meer

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Methods Mentioned

BETA
ELISA
PCR

Software Mentioned

SAS
- PC

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