Document Detail

The effect of becoming BVDV-free on fertility and udder health in Dutch dairy herds.
MedLine Citation:
PMID:  18155307     Owner:  NLM     Status:  MEDLINE    
The aim of the study was to investigate the effect of BVDV-free certification of dairy herds on fertility and udder health. Cases were defined as dairy herds that had at least one BVDV-antigen positive animal, subsequently gained the BVDV-free status by participating in the BVDV-control programme of the Animal Health Service (AHS) and maintained this status for at least 2 years. Controls had an unknown status for BVDV and two controls were matched to one case by region and herd size. Data concerning fertility and milk production of all herds were provided by The Dutch Royal Cattle Syndicate (NRS). After validation, data of 79,607 cows of 392 case herds and 124,831 cows of 730 control herds were analysed on ten fertility and three udder health parameters. For the analyses all observations were aggregated at herd level. To account for the matching, differences for fertility parameters were calculated between each of the two pairs of case-control within a matching code. The analyses were performed with these differences as dependent variables. Mixed models and GEE models were used for the statistical analyses of fertility and udder health. Case herds had a significantly lower abortion rate in the BVDV-free period than controls herds (10.3% versus 11.6%, P<0.01) while there was no significant difference for the other fertility parameters. There was no effect on mastitis prevalence or bulk-milk SCC but the mastitis incidence significantly decreased for case herds in the BVDV-free period (cases 0.6 % lower than controls, P<0.05). In our study the effect of getting the BVDV-free status may have been underestimated for several reasons like an unknown status for control herds, not knowing when an acute infection occurred in case herds and not knowing the management for both cases and controls. Interestingly, both significant variables, being abortions and mastitis incidence, are parameters that are more difficult to influence by the farmer than the other parameters (e.g. calving interval).
I M G A Berends; W A J M Swart; K Frankena; J Muskens; T J G M Lam; G van Schaik
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-12-26
Journal Detail:
Title:  Preventive veterinary medicine     Volume:  84     ISSN:  0167-5877     ISO Abbreviation:  Prev. Vet. Med.     Publication Date:  2008 Apr 
Date Detail:
Created Date:  2008-02-25     Completed Date:  2008-06-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8217463     Medline TA:  Prev Vet Med     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  48-60     Citation Subset:  IM    
Quantitative Veterinary Epidemiology group, Wageningen Institute of Animal Sciences, Wageningen University, Wageningen, The Netherlands.
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MeSH Terms
Animal Husbandry
Bovine Virus Diarrhea-Mucosal Disease / epidemiology,  physiopathology,  virology*
Diarrhea Viruses, Bovine Viral / isolation & purification*,  pathogenicity,  physiology
Fertility / physiology*
Mammary Glands, Animal / physiology*,  virology
Mastitis, Bovine / epidemiology*
Netherlands / epidemiology

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