herd. Using data on bovine viral diarrhoea virus (BVDV) in Scotland as a case example, this study
provides empirical and theoretical evidence that the risk of disease transmission varies substantially based on the
animal and herd demographic characteristics at the time of purchase. Multivariable logistic regression analysis
revealed that purchasing pregnant heifers and open cows sold with a calf at foot were associated with an increased
risk of beef herds being seropositive for BVDV