Associations between animal characteristic and environmental risk factors and bovine respiratory disease in Australian feedlot cattle

Preventive Veterinary Medicine
K E HayT S Barnes

Abstract

A prospective longitudinal study was conducted in a population of Australian feedlot cattle to assess associations between animal characteristic and environmental risk factors and risk of bovine respiratory disease (BRD). Animal characteristics were recorded at induction, when animals were individually identified and enrolled into study cohorts (comprising animals in a feedlot pen). Environmental risk factors included the year and season of induction, source region and feedlot region and summary variables describing weather during the first week of follow-up. In total, 35,131 animals inducted into 170 cohorts within 14 feedlots were included in statistical analyses. Causal diagrams were used to inform model building and multilevel mixed effects logistic regression models were fitted within the Bayesian framework. Breed, induction weight and season of induction were significantly and strongly associated with risk of BRD. Compared to Angus cattle, Herefords were at markedly increased risk (OR: 2.0, 95% credible interval: 1.5-2.6) and tropically adapted breeds and their crosses were at markedly reduced risk (OR: 0.5, 95% credible interval: 0.3-0.7) of developing BRD. Risk of BRD declined with increased induction weight, with cattl...Continue Reading

References

Nov 1, 1995·The Journal of Infectious Diseases·D Dunn, M L Newell
Nov 10, 2001·Journal of the American Veterinary Medical Association·G H LoneraganM A Smith
May 2, 2006·The Veterinary Journal·S HägglundS Alenius
Jul 26, 2006·Journal of Animal Science·G D SnowderG L Bennett
Mar 20, 2009·Preventive Veterinary Medicine·Emilie Gay, Jacques Barnouin
May 26, 2009·Journal of Animal Science·C D ReinhardtL R Corah
Aug 4, 2011·Epidemiology·Johannes TextorSven Knüppel
May 28, 2014·Australian Veterinary Journal·P F HorwoodT J Mahony

❮ Previous
Next ❯

Citations

Jun 25, 2019·Transboundary and Emerging Diseases·Thalita Evani Silva OliveiraSelwyn Arlington Headley
Jun 20, 2018·Microbiology Spectrum·David H Lloyd, Stephen W Page

❮ Previous
Next ❯