Complejo respiratorio bovino: evidencia de circulación viral múltiple en un establecimiento de cría

Translated title of the contribution: Bovine respiratory complex: Evidence of multiple viral circulation in a breeding farm

N. Streitenberger, A. Ferella, M. S. Pérez Aguirreburualde, A. Sammarruco, M. J. Dus Santos, M. V. Mozgovoj, S. Maidana, S. A. Romera, A. Pecora, M. A. Quiroga, L. E. Fazzio

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Abstract

Bovine respiratory complex (BRC) is a leading cause of production loss among beef, dairy and feedlot cattle. The infectious agents involved are viruses, bacteria and mycoplasma. Viral agents include Bovine respiratory syncytial virus (BRSV), Bovine parainfluenza-3 virus (BPI3V), Bovine herpesvirus 1 (BHV-1) and Bovine viral diarrhea virus (BVDV). The purpose of this study was to evaluate the circulation of viruses associated with BRC in a beef herd, postweaning, doing a longitudinal assessment of serological tests. Moreover, clinical and hematological findings were described and compared. Thirty two animals between 5 to 7 months old, with no vaccination record, were selected for a daily evaluation of clinical signs consistent with BRC. Blood samples were taken on day 0 (weaning), +14 and +25 (when the study ended). No clinical manifestation of BRC was found and hematological parameters were within the reference range. At the beginning of this study, animals did not show BRSV-specific antibodies (Ab), whereas for the other viral agents the percentage of seropositive animals varied: 53% (BVDV1a), 31% (BPI3V), 25% (BVDV2) and 13% (BHV-1). On day +25, percentages of seropositive animals were 47% (BVDV1a), 50% (BPI3V), 19% (BVDV2), 25% (BHV-1) and 81% (BRSV). Seroconversion percentages for BRSV, BPI3V, BVDV1a and BHV-1 were 34%, 25%, 16% and 13% respectively. Furthermore, 66% of the animals seroconverted to one or more viruses. No seroconversion was observed for BVDV2 and BVDV1b. Thus, there is evidence of circulation and -in some cases- co-infection with BRC-associated viral agents during postweaning. At said production stage, conducting viral follow-up studies to identify and characterize circulating strains is key, particularly in relation to BRSV and PI3, which we have little information about in our country.

Translated title of the contributionBovine respiratory complex: Evidence of multiple viral circulation in a breeding farm
Original languageSpanish
Pages (from-to)149-155
Number of pages7
JournalRevista de Investigaciones Agropecuarias
Volume43
Issue number2
StatePublished - Aug 2017

Keywords

  • BRC
  • Clinical
  • Hematology
  • Postweaning
  • Serology
  • Viruses

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    Streitenberger, N., Ferella, A., Pérez Aguirreburualde, M. S., Sammarruco, A., Dus Santos, M. J., Mozgovoj, M. V., Maidana, S., Romera, S. A., Pecora, A., Quiroga, M. A., & Fazzio, L. E. (2017). Complejo respiratorio bovino: evidencia de circulación viral múltiple en un establecimiento de cría. Revista de Investigaciones Agropecuarias, 43(2), 149-155.