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The Effect of Bovine Virus Diarrhoea Virus on Reproduction in Recently Infected Norwegian Dairy Herds

Innvirkning av bovin virusdiaré-virus på reproduksjon i nyinfiserte norske melkeku-besetninger

Abstract

A group of 32 dairy herds, recently infected with bovine virus diarrhoea virus (BVDV), was compared with a control group consisting of 75 BVDV free herds during a 3-year-period. Variables related to reproduction were registered. Results of multiple antibody examinations in bulk milk as well as samples of milk and blood from younger animals were used to select the herds. The incidence of abortions was statistically significantly different in the 2 groups, while the number of stillbirths, weak born calves, and congenital anomalies was not. Other variables such as percentage of non return, average number of inseminations per cow and calving interval showed during the study a trend to improve in the BVDV group, while they remained stable in the control group.

Sammendrag

En gruppe på 32 melkekubesetninger som var nyinfiserte med bovin virusdiaré-virus (BVDV), ble sammenlignet med en kontroll-gruppe bestående av 75 BVDV-frie besetninger. Reproduksjonsparametre ble registrert over en periode på 3 år. Resultater fra anti-stoff-undersøkelser av tankmelk, samlemelk-prøver fra kviger og samle-blodprøver fra ungdyr ble brukt for å velge ut besetningene. Insidensen av aborter var signifikant forskjellig i de 2 gruppene, mens insidensen av dødfødsler, svakfødte kalver og medfødte misdannelser ikke var det. Andre variabler som ikkeomløps-prosent, gjennomsnittlig antall inseminasjoner per påbegynt ku og gjennomsnittlig kalvingsintervall viste en tendens til å bedres i løpet av studietiden i BVDV-gruppen, mens de tilsvarende verdier for kontroll-gruppen forble stabile.

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Acknowledgments

We are grateful to the Norwegian Control Programme for BVD/MD represented by its leader Ola Nyberg for kindly letting us use data from the programme. The access to data from the national milk recording system has been of great value, and we are grateful for help and cooperation during the work. We also appreciate being allowed to use data from Dag Lindheim's pilot project in Rogaland county, as well as the results of antibody testing done by the Norwegian Cattle Association (NRF), Hamar, concerning the year prior to the start of the national programme.

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Correspondence to B. Fredriksen.

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Fredriksen, B., Ødegaard, S. & Løken, T. The Effect of Bovine Virus Diarrhoea Virus on Reproduction in Recently Infected Norwegian Dairy Herds. Acta Vet Scand 39, 99–108 (1998). https://doi.org/10.1186/BF03547811

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