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The contribution of previous lameness events and body condition score to the occurrence of lameness in dairy herds: a study of 2 herds

Randall, L.V.; Green, M.J.; Green, L.E.; Chagunda, M.G.G.; Mason, C.; Archer, S.C.; Huxley, J.N.

Authors

L.V. Randall

M.J. Green

L.E. Green

M.G.G. Chagunda

C. Mason

J.N. Huxley jon.huxley@nottingham.ac.uk



Abstract

It has been demonstrated that low body condition and previous occurrence of lameness increase the risk of future lameness in dairy cows. To date the population attributable fraction (PAF), which provides an estimate of the contribution that a risk factor makes toward the total number of disease events in a population, has not been explored for lameness using longitudinal data with repeated measures. Estimation of PAF helps to identify control measures that could lead to the largest improvements on-farm. The aim of this study was to use longitudinal data to evaluate the proportion of lameness that could be avoided in 2 separate herds (2 populations) through (1) reduced recurrence of previous lameness events, (2) and moving body condition score (BCS) into more optimal ranges. Data were obtained from 2 UK dairy herds: herd A, a 200-cow herd with 8 yr of data from a total of 724 cows where lameness events were based on weekly locomotion scores (LS; 1 to 5 scale), and herd B, a 600-cow herd with data recorded over 44 mo from a total of 1,040 cows where treatment of clinical cases was used to identify lameness events. The PAF for categories of BCS were estimated using a closed equation appropriate for multiple exposure categories. Simulation models were used to explore theoretical scenarios to reflect changes in BCS and recurrence of previous lameness events in each herd. For herd A, 21.5% of the total risk periods (cow-weeks) contained a lameness event (LS 3, 4, or 5), 96% of which were repeat events and 19% were recorded with BCS 16 wk before a risk period. The median PAF estimated for changes in BCS were in the region of 4 to 11%, depending on severity of lameness. Repeated bouts of lameness made a very large contribution to the total number of lameness events. This could either be because certain cows are initially susceptible and remain susceptible, due to the increased risk associated with previous lameness events, or due to interactions with environmental factors. This area requires further research.

Journal Article Type Article
Publication Date Feb 2, 2018
Journal Journal of Dairy Science
Print ISSN 0022-0302
Electronic ISSN 1525-3198
Publisher American Dairy Science Association
Peer Reviewed Peer Reviewed
Volume 101
Issue 2
APA6 Citation Randall, L., Green, M., Green, L., Chagunda, M., Mason, C., Archer, S., & Huxley, J. (2018). The contribution of previous lameness events and body condition score to the occurrence of lameness in dairy herds: a study of 2 herds. Journal of Dairy Science, 101(2), https://doi.org/10.3168/jds.2017-13439
DOI https://doi.org/10.3168/jds.2017-13439
Keywords Lameness; Dairy cattle; Population attributable fraction; Body condition score; Previous lameness events
Publisher URL https://doi.org/10.3168/jds.2017-13439
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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