Veterinary Research Communications

, Volume 21, Issue 6, pp 421–430 | Cite as

Bacterial Identity and Characteristics in Healthy and Unhealthy Respiratory Tracts of Sheep and Calves

  • E.K. Barbour
  • N.H. Nabbut
  • S.K. Hamadeh
  • H.M. Al-Nakhli

Abstract

Barbour, E.K., Nabbut, N.H., Hamadeh, S.K. and Al-Nakhli, H.M., 1997. Bacterial identity and characteristics in healthy and unhealthy respiratory tracts of sheep and calves. Veterinary Research Communications, 21 (6), 421-430

The aim of this study was to compare different bacteriological aspects of the respiratory systems of healthy (H) versus unhealthy (UH) animals with respiratory signs. The prevalence of different bacterial species was determined in the upper and lower respiratory tract of H and UH Najdi sheep, Somali sheep and Holstein calves. The characteristics of Pasteurella spp. isolates, and the biotype of Pasteurella haemolytica were identified in H and UH animals. Eighteen out of 28 (64.3%) of the identified bacterial species in the upper respiratory tract were more prevalent in the nasal cavities of UH Najdi and Somali sheep and Holstein calves with respiratory signs than in apparently healthy animals; four of the most prevalent bacteria in the upper respiratory system of UH sheep were Moraxella spp., Pseudomonas pseudomallei, Erysipelothrix spp., and Pasteurella multocida, while three of the most prevalent bacteria in UH calves were Pasturella haemolytica, Actinomyces spp., and Pseudomonas aeruginosa. The prevalence of six different bacterial species was greater in the lungs of UH animals, namely Actinomyces pyogenes, Erysipelothrix spp., P. haemolytica, Pasteurella ureae, Staphylococcus aureus, and Staphylococcus epidermidis, which could be risk factors in the complexity of the prevalent respiratory diseases of the animals surveyed.

Of the biochemical, cytological and colonial characteristics studied in the identified P. haemolytica and P. multocida, two characters were significantly different (p < 0.05) in organisms isolated from UH as compared to those from H animals. These were the higher loss of haemolytic power by the strains of P. haemolytica and the decreased fermentation of trehalose by all the strains of P. multocida recovered from healthy animals.

The only biotype of P. haemolytica isolated from H animals was biotype A, while both biotypes A (88.0% of the isolates) and T (12.0% of the isolates) were recovered from UH animals.

bacteria calves lungs Pasteurella respiratory tract Saudi Arabia sheep 

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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • E.K. Barbour
    • 1
  • N.H. Nabbut
    • 2
  • S.K. Hamadeh
    • 1
  • H.M. Al-Nakhli
    • 3
  1. 1.Department of Animal Science, Faculty of Agricultural and Food SciencesAmerican University of BeirutBeirutLebanon
  2. 2.Department of Microbiology and Immunology, Faculty of MedicineAmerican University of BeirutBeirutLebanon
  3. 3.Animal Production and Health Section, National Agriculture and Water Research Center, Ministry of Agriculture and WaterRiyadhSaudi Arabia

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