There are numerous calf rearing systems but the last decade has seen increased interest in the use of computerised machine feeders for group reared calves in place of systems based on bucket rearing with individual housing. Automated machines are expensive but are becoming more common due to reductions in labour and advances in technology allowing regulation of milk intakes (Hepola, 2003). The objective of this experiment was to evaluate the effect of rearing dairy-bred bull calves on either a computerised machine or twice a day milk feeding system to weaning at 6 weeks old.