Epidemiological observations in a corriedale flock affected by Brucella ovis

C. A. Robles, Francisco A Uzal, F. V. Olaechea, C. Low

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Brucellosis in sheep, caused by Brucella ovis, is primarily a chronic infectious disease of rams with epididymitis as its most characteristic lesion. Six hundred rams from an infected farm were clinically and serologically examined once a year, over a 3-year period. An increase from 2.1% to 6.3% in the prevalence of animals serologically positive to B. ovis occurred over the 3 years. However, the prevalence of rams with lesions in the reproductive tract declined from 14.2% to 6.5% in the third year following one year of strict culling of clinically affected and rams that were serologically positive for B. ovis. Clinical lesions found in the 179 affected rams fell into two main categories: rams with epididymitis and rams with affected lymph nodes. These results suggest that the prevalence of the disease relates mainly to the sexual activity of the animal and not to age in itself. A single cull based on the results of clinical examination and serological test results was unable to decrease the prevalence of B. ovis in an extensive Corriedale sheep flock.

Original languageEnglish (US)
Pages (from-to)435-443
Number of pages9
JournalVeterinary Research Communications
Volume22
Issue number7
StatePublished - 1998
Externally publishedYes

Keywords

  • Brucella ovis
  • Control
  • Epidemiology
  • Epididymitis
  • Reproduction
  • Serology
  • Sheep

ASJC Scopus subject areas

  • veterinary(all)

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