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Reduction in daily milk yield associated with subclinical bovine herpesvirus 1 infection
  1. J. M. E. Statham, VetMB, MA, DCHP, MRCVS1,
  2. L. V. Randall, BVSc, MRCVS1,2 and
  3. S. C. Archer, BVMS, MSc, CertCHP, PhD, MRCVS2
  1. 1RAFT Solutions Ltd, Bishopton Veterinary Group, Mill Farm, Studley Road, Ripon, North Yorkshire, HG4 2QR, UK
  2. 2School of Veterinary Medicine and University of Nottingham, School of Veterinary Medicine and Science, Sutton Bonington Campus, Sutton Bonington, Leicestershire, LE12 5RD, UK
  1. E-mail for correspondence: jonathan{at}


The aim of this observational cohort study was to investigate the potential economic impact of subclinical bovine herpesvirus 1 (BoHV-1) infection in a commercial UK dairy herd in terms of milk yield depression. Infection status of cows (infected or not infected) was assigned from serology on a single occasion. A multi-level linear model was used to evaluate the impact of infection status on milk production, using milk records that were routinely collected over two years. BoHV-1 seropositive cows produced 2.6 kg/day less milk over the study period compared with cows that were seronegative. This result highlights the importance of appropriate management of risks associated with subclinical infection with BoHV-1 as part of proactive herd health and production management.

  • Bovine herpesvirus
  • Infectious bovine rhinotracheitis (IBR)
  • Milk
  • Biosecurity
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