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  • Author or Editor: Chet B. Thomas x
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Objective—To evaluate the features, underlying causes, results of diagnostic testing, and treatment of pneumothorax in dairy cattle.

Design—Retrospective study.

Animals—30 dairy cattle.

Procedure—Medical records of all cattle with a diagnosis of pneumonia were reviewed. For cattle with pneumothorax, information was obtained pertaining to signalment, anamnesis, diagnosis, treatment, and outcome. Survival data were compared between cattle with pneumonia with or without pneumothorax.

Results—Pneumothorax was associated with bronchopneumonia in 18 cattle, interstitial pneumonia in 7 cattle, pharyngeal or laryngeal trauma in 3 cattle, and neonatal respiratory distress in 2 calves. Bovine respiratory syncytial virus was the most commonly detected infectious agent. Eighteen of 30 (60%) cattle survived; 8 were euthanatized and 4 died. Survival rate was 81% for cattle with pneumonia without pneumothorax during the same time period. Pneumothorax was a significant risk factor for failure to survive to discharge from the hospital for cattle with underlying chronic bronchopneumonia.

Conclusions and Clinical Relevance—Pneumothorax in dairy cattle appears to occur most commonly in association with chronic bronchopneumonia. Cattle of both sexes and all ages can be affected. (J Am Vet Med Assoc 2004;225:732–735)

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in Journal of the American Veterinary Medical Association


Objective—To determine whether Salmonella spp could be isolated from the environment of free stall dairies in Wisconsin without any history of clinical salmonellosis and determine the serotype and antimicrobial susceptibility of any Salmonella isolates recovered from the environment.

Design—Cross-sectional study.

Study Population—20 free stall dairies with no history of clinical salmonellosis.

Procedures—Dairy owners completed a questionnaire regarding management and production practices. Multiple swab samples were obtained from throughout the free stall facilities and submitted for bacterial culture for Salmonella spp. Odds ratios were calculated to compare herd-level risk factors between dairies from which Salmonella organisms were isolated and herds from which Salmonella organisms were not isolated.

ResultsSalmonella organisms were isolated from 9 of the 20 (45%) dairies. Salmonella serotype Meleagridis was isolated from 4 dairies, S Meleagridis and S Kentucky were isolated from 2 dairies, S Meleagridis and S Cyprus were isolated from 1 dairy, S Cerro was isolated from 1 dairy, and S Corvallis was isolated from 1 dairy. All isolates were susceptible to all antimicrobial agents tested. None of the potential risk factors analyzed demonstrated a significant association with an increased likelihood of isolating Salmonella spp.

Conclusions and Clinical Relevance—Environmental Salmonella contamination was demonstrated on free stall dairies with no history of clinical salmonellosis. (J Am Vet Med Assoc 2004;225:574–577)

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in Journal of the American Veterinary Medical Association