Sole haemorrhages in Danish bull calves: Prevalence and risk factors.

To evaluate the prevalence of sole haemorrhages among Danish dairy breed bull calves and associated risk factors, 730 calves were hoof trimmed shortly before slaughter and the presence of sole haemorrhages was recorded. Associations between the outcomes sole haemorrhages and severe sole haemorrhages, and the explanatory variables daily weight gain, liver abscesses and flooring, were analysed. Of the 730 calves, 545 (74.7%) had sole haemorrhages and 119 (16.3%) had severe sole haemorrhages. Calves housed on slatted concrete floors with cubicles had higher odds of sole haemorrhages (odds ratio, OR, 2.69, 95% confidence interval, CI, 1.81-4.00; P<0.001) and severe sole haemorrhages (OR 2.07, 95% CI 1.36-3.14; P<0.001) than calves housed on deep litter straw. The odds of severe sole haemorrhages increased with increasing daily weight gain (OR 1.28, 95% CI 1.07-1.54 for an increase of 100g/day; P=0.008).