Risk factors for congenital chondrodystrophy of unknown origin in beef cattle herds in south-eastern Australia

Preventive Veterinary Medicine
Peter J WhiteJenny-Ann L M L Toribio

Abstract

A case-control study was conducted on 46 farms in south-eastern Australia with a recent history of congenital chondrodystrophy of unknown origin (CCUO) between 2002 and 2007. For each farm data was collected using face-to-face interviews concerning the management of case and control mobs during the gestation period in which affected calves were born. Data concerning the paddocks in which gestating cattle were maintained was also collected for analysis. Three separate multivariable models were constructed using generalised linear mixed models (GLMMs). The first model was based on the dichotomous outcome of mob status (affected/not affected) and included explanatory variables for management and environment factors. The second model used a novel approach, taking into account the number of cases in affected mobs in order to utilise available data. The outcome events/trials was used where the numerator was equal to the number of affected calves in a mob, and the denominator was equal to the total number of calves in the mob. The third model used the dichotomous outcome paddock status and included environmental and soil variables for paddocks involved with case and control mobs. Confounding for dam age and year affected was included ...Continue Reading

Citations

May 29, 2012·The Veterinary Journal·Peter J White, Peter A Windsor
Jul 22, 2016·Reproduction, Fertility, and Development·K D SinclairC M Dwyer

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