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Population-level effects of risk factors for bovine respiratory disease in Australian feedlot cattle

Research paper by K.E. Hay, J.M. Morton, A.C.A. Clements, T.J. Mahony, T.S. Barnes

Indexed on: 22 Mar '17Published on: 04 Mar '17Published in: Preventive Veterinary Medicine



Abstract

Results obtained from a nationwide longitudinal study were extended to estimate the population-level effects of selected risk factors on the incidence of bovine respiratory disease (BRD) during the first 50 days at risk in medium-sized to large Australian feedlots. Population attributable fractions (PAF) and population attributable risks (PAR) were used to rank selected risk factors in order of importance from the perspective of the Australian feedlot industry within two mutually exclusive categories: ‘intervention’ risk factors had practical strategies that feedlot managers could implement to avoid exposure of cattle to adverse levels of the risk factor and a precise estimate of the population-level effect while ‘others’ did not. An alternative method was also used to quantify the expected effects of simultaneously preventing exposure to multiple management-related factors whilst not changing exposure to factors that were more difficult to modify.