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Prevalence of Bovine Leukemia Virus Antibodies in US Dairy Cattle
Joint Authors
Byrem, Todd M.
Bartlett, Paul C.
LaDronka, Rebecca M.
Ainsworth, Samantha
Wilkins, Melinda J.
Norby, Bo
Source
Veterinary Medicine International
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-11-11
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
Objective.
To estimate current US herd-level and animal-level prevalence of bovine leukemia virus (BLV) in dairy cows and characterize epidemiologic features.
Design.
Cross-sectional observational study design and survey.
Animals.
4120 dairy cows from 103 commercial dairy herds in 11 states across the US.
Procedures.
Milk samples were collected from dairy cows through routine commercial sampling and tested for anti-BLV antibodies by antibody capture ELISA.
Based on the ELISA results of a sample of an average of 40 cows per herd, within-herd apparent prevalence (AP) was estimated by a directly standardized method and by a lactation-weighted method for each herd.
Within-herd AP estimates were summarized to give estimates of US herd-level and animal-level AP.
Differences in AP by lactation, region, state, breed, and herd size were examined to characterize basic epidemiologic features of BLV infection.
Results.
94.2% of herds had at least one BLV antibody positive cow detected.
The average within-herd standardized AP was 46.5%.
Lactation-specific AP increased with increasing lactation number, from 29.7% in first lactation cows to 58.9% in 4th and greater lactation cows.
Significant differences were not observed based on region, state, breed, or herd size.
Conclusions and Clinical Relevance.
These results are consistent with a historical trend of increasing prevalence of BLV among US dairy cattle.
Given the findings of other studies on the negative impacts of BLV infection on milk production and cow longevity, these findings are clinically relevant for veterinarians counseling dairy clients on the risks of BLV to their herds.
American Psychological Association (APA)
LaDronka, Rebecca M.& Ainsworth, Samantha& Wilkins, Melinda J.& Norby, Bo& Byrem, Todd M.& Bartlett, Paul C.. 2018. Prevalence of Bovine Leukemia Virus Antibodies in US Dairy Cattle. Veterinary Medicine International،Vol. 2018, no. 2018, pp.1-8.
https://search.emarefa.net/detail/BIM-1215696
Modern Language Association (MLA)
LaDronka, Rebecca M.…[et al.]. Prevalence of Bovine Leukemia Virus Antibodies in US Dairy Cattle. Veterinary Medicine International No. 2018 (2018), pp.1-8.
https://search.emarefa.net/detail/BIM-1215696
American Medical Association (AMA)
LaDronka, Rebecca M.& Ainsworth, Samantha& Wilkins, Melinda J.& Norby, Bo& Byrem, Todd M.& Bartlett, Paul C.. Prevalence of Bovine Leukemia Virus Antibodies in US Dairy Cattle. Veterinary Medicine International. 2018. Vol. 2018, no. 2018, pp.1-8.
https://search.emarefa.net/detail/BIM-1215696
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1215696