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Updated: Nov 6, 2025

The Bovine Lung in Biomedical Research: Visually Guided Bronchoscopy, Intrabronchial Inoculation and In Vivo Sampling Techniques
Published on: July 3, 2014
Association between computer-aided lung auscultation and treatment failure risk in calves treated for respiratory
Calvin W Booker1, G Kee Jim1, Tracey M Grimson1
1Feedlot Health Management Services, Okotoks, Alberta (Booker, Jim, Grimson, Wildman); Saltgrass Veterinary and Production Services, Kaysville, Utah, USA (Hill); Merck Animal Health, 35500 West 91st Street, Desoto, Kansas, USA (Nickell).
Abstract:
The use of computer-aided lung auscultation (CALA, Whisper Veterinary Stethoscope; Merck Animal Health, Madison, New Jersey, USA) is a relatively new approach to assist in confirming the diagnosis of bovine respiratory disease (BRD). For this prospective cohort study at 1 feedlot in the United States, a CALA score was generated for 2726 feeder cattle (calf-fed Holsteins and mixed-breed beef animals) at the time of the first BRD diagnosis and treatment. All cattle were treated according to the same BRD protocol prescribed for that facility and the protocol was not influenced by the CALA score. Data were collected for 120 d after enrollment. In this study, the risk of BRD retreatment and the risk of BRD mortality were each significantly (P < 0.05) associated with the CALA score at the time of first BRD diagnosis and treatment, and those risks increased (numerically and in some cases statistically) as the CALA score increased.
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