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Objective: To compare Pasteur Ella Spp. isolates of the
nasopharyngeal cultures in healthy and unhealthy Holstein
(dairy calf pneumonia) calves.
Design: Case control study.
Animals: Sixty Holstein calves from two weeks up to six- month-old in dairy farms of Mashhad Suburb were
selected.
Procedure: In the affected calves, the clinical findings
were recorded and nasopharyngeal swabs were also taken.
Apparently healthy calves were chosen from the same
farm as control.
Statistical analysis: t-test, Mann-Whitney and Chi-square. Results: Clinical findings including respiratory rate, heart rate, rectal temperature, and illness index scores were
significantly different between healthy and unhealthy
calves (P various pathogens from healthy and unhealthy calves were evaluated by contingency table Chi-square analysis.
Pasteurella multicida was isolated more frequently from
nasopharynx in affected group than in control one
(P frequently in affected ones than controls. However, its
difference was not significant (P>O.05).
Conclusion: Results indicate that Pasteurella multicida
was isolated more frequently from nasopharynx in affected
calves than in control group. However isolation of
Mannheimia hemolytica was not strongly associated with
respiratory disease. J.Fac. Vet. Med. Univ. Tehran.
61,2:147-153,2006.