Associations between animal characteristic and environmental risk factors and bovine respiratory disease in Australian feedlot cattle
| Autor: | Timothy J. Mahony, K.E. Hay, Tamsin S. Barnes, John M. Morton, Archie C. A. Clements |
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| Rok vydání: | 2015 |
| Předmět: |
Veterinary medicine
Longitudinal study 040301 veterinary sciences Population Bovine respiratory disease Bovine Respiratory Disease Complex Cattle Diseases Biology Environment Logistic regression 0403 veterinary science Animal science Food Animals Risk Factors Angus cattle medicine Credible interval Animals Longitudinal Studies Prospective Studies education education.field_of_study Body Weight 0402 animal and dairy science Australia 04 agricultural and veterinary sciences medicine.disease 040201 dairy & animal science Breed Feedlot Animal Science and Zoology Cattle Seasons |
| Zdroj: | Preventive veterinary medicine. 125 |
| ISSN: | 1873-1716 |
| Popis: | 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 cattle in the heaviest weight category (≥480kg) at moderately reduced risk compared to cattle weighing |
| Databáze: | OpenAIRE |
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