Diagnostic accuracy of Wisconsin and California scoring systems to detect bovine respiratory disease in preweaning dairy calves under subtropical environmental conditions

• DOI: 10.3168/jds.2021-21491
• Publication Date: 2022-08-02T20:47:42Z
• Authors: Nathalia Decaris; Sébastien Buczinski; Daniela Irlanda C...; Luana Camargo; Natali Regina Sch...; Stefano Carlo Fil...; Amelia R. Woolums; Viviani Gomes
• Keywords: Bovine Respiratory Disease

Bovine respiratory disease (BRD) is a multifactorial which causes short- and long-term negative effects. Early detection crucial for prompt response to therapy, as well decrease mortality risk. Clinical scoring systems have been developed mostly in North America screening calves at risk or suspected of having BRD, these tools also applied subtropical tropical countries. However, it has unknown whether had the same accuracy environmental conditions. Therefore, this study evaluated 4 different field techniques, serum haptoglobin (HAP), diagnose BRD Holstein dairy The tests used were thoracic ultrasound (TUS; positive if consolidation depth ≥1 cm), auscultation (AUSC; crackles, wheezes, silent areas present), Wisconsin score (WISC; ≥2 categories with scores ≥2), California (CALIF; total ≥5). Also, HAP was measured classified ≥15 mg/dL. Heifers between 30 d age weaning (n = 482), residing on 17 commercial dairies São Paulo state, enrolled study. Bayesian latent class models informative priors evaluate TUS, AUSC, HAP, noninformative WISC CALIF. percentage each test farm ranged from 0 56% WISC, 11-51% CALIF, 0-72% 0-32% 0-100% HAP. sensitivity (Se; 95% credible interval) specificity (Sp) 77.9% (64.8-90.2) 81.9% (76.3-88.2). For Se 67.1% (53.6-80.1) Sp 79.1% (73.9-84.6). TUS 59.8% (46.5-73.1) 84.8% (80.0-89.5), 58.8% (41.3-79.8) 98.6% (95.7-99.9). 67.6% (55.3-78.8) 46.7% (41.4-52.2), respectively. performance similar to, better than, found American studies, despite fact that environment.