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Validation of disease recordings in Swedish dairy cattle

Jansson Mörk, Marie (2009). Validation of disease recordings in Swedish dairy cattle. Diss. (sammanfattning/summary) SLU : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2009:66
ISBN 978-91-576-7413-5
[Doctoral thesis]

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Abstract

This thesis examines the completeness of the Swedish dairy disease recording system: it attempts to quantify how much disease the system’s database captures relative to what farmers find and veterinarians treat. Two field studies were conducted. In the first, 177 farmers recorded information about disease events, regardless of whether the disease event had resulted in a veterinary visit. In the second, farm copies of veterinary records (851 records from 112 herds) were collected. The proportion of disease events receiving veterinary treatment was estimated, and measures of disease incidence based on the farmers’ data were compared with incidences estimated from the Dairy Disease Database (ddd). Further, the completeness of the ddd was estimated based on agreement between information in the ddd and farmer-reporting and herd-copies, respectively. Differential completeness was also evaluated. Finally, the probability of a successfully registered disease event for the whole disease recording process was estimated for five different disease complexes, based on the results of both field studies. The overall completeness of veterinary treated disease events in the ddd was estimated to be 71% and 75%, based on the farmers’ recordings and on the farm copies, respectively. Differential completeness linked to regions, veterinary employment type and between different groups of animals was found. The probability of a successfully registered disease event (regardless of veterinary treatment) in the ddd varied between 30% for diarrhoea and 72% for puerperal paresis. Whether or not the farmer contacted a veterinarian was found to be the most influential step in the recording process, followed by whether or not the disease record was registered in the raw data file at the Swedish Dairy Association. Lack of completeness in the ddd will result in conservative disease incidence measures. Underreporting of veterinary treated disease events, as well as undercoverage of farmer-observed events, was found to vary depending on several factors which could introduce bias in estimates based on the ddd, which primarily is a problem if the data are used for epidemiologic research and less so for other areas.

Authors/Creators:Jansson Mörk, Marie
Title:Validation of disease recordings in Swedish dairy cattle
Year of publishing :2009
Volume:2009:66
Number of Pages:75
Papers/manuscripts:
NumberReferences
ALLI. Mörk, M., Lindberg, A., Alenius, S., Vågsholm, I. and Egenvall, A. (2009). Comparison between dairy cow disease incidence in data registered by farmers and in data from a disease-recording system based on veterinary reporting. Preventive Veterinary Medicine 88, 298-307. II. Jansson Mörk, M., Wolff, C., Lindberg, A., Vågsholm, I. and Egenvall, A. (2009). Validation of a national disease recording system for dairy cattle against veterinary practice records (Accepted). III. Jansson Mörk, M., Emanuelson, U., Lindberg, A., Vågsholm, I. and Egenvall, A. (2009). Herd and cow characteristics affecting the odds of veterinary treatment for disease – a multilevel analysis. Acta Veterinaria Scandinavica 51:34. IV. Jansson Mörk, M., Egenvall, A., Vågsholm, I. and Lindberg, A. Estimation of the diagnostic sensitivity of a disease recording database for dairy cattle – a scenario tree approach (Manuscript).
Place of Publication:SLU
ISBN for printed version:978-91-576-7413-5
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:dairy cows, disease control, epidemiology, monitoring, databases, data collection, data analysis, sweden
Keywords:dairy cow, epidemiology, disease monitoring system, validity, completeness, sensitivity, differential misclassification, detectable
URN:NBN:urn:nbn:se:slu:epsilon-2994
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-2994
ID Code:2130
Department:(VH) > Dept. of Clinical Sciences
Deposited By: Marie Jansson Mörk
Deposited On:09 Oct 2009 00:00
Metadata Last Modified:02 Dec 2014 10:16

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