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Bovine Viral Diarrhoea Virus Infection in Beef Heifers in Commercial Herds in Australia; a Risk Assessment Approach Is More Appropriate Than a Partial Budgeting Approach When Considering Control Strategies
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Objectives:
To describe mob-level seroprevalences and incidences of seroconversion to bovine viral diarrhoea virus (BVDV) in beef heifers in commercial herds in Australia.
Methods:
A prospective longitudinal study was conducted using thirty eight mobs (management groups) from Queensland, New South Wales, Victoria and Western Australia consisting of approximately 4,600 non-pregnant beef heifers (i.e. female cattle that had never calved) not vaccinated against BVDV selected by eleven collaborating veterinary practitioners. Seroprevalences were assessed in each mob between 2 and 7 months before mating start date using an agar gel immunodiffusion (AGID) test for BVDV antibodies. Fifteen mobs considered to be at higher risk of BVDV transmission during the upcoming mating period (those with lowest seroprevalences at this initial serological assessment and greatest risks of BVDV introduction through anticipated contact with other cattle) underwent further serological monitoring using the AGID test, with sera collected from between 17 and 26 randomly selected unvaccinated heifers in each mob a) shortly before mating start date and b) at pregnancy testing (between 99 and 218 days after mating start date). (All heifers in these mobs were also included in a double blind controlled trial to assess vaccine efficacy; approximately half of the heifers in each mob were vaccinated. Results of this trial are reported in Morton et al, Australian Veterinary Journal 2013;91:517-524.). […]
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