A common problem found in dairy herds is intersuckling, which is defined as juvenile or adult cattle sucking the udder of other cows within the herd. Intersuckling can cause udder health problems in the recipients. The cause is unknown, as are management methods that may prevent this behavioural problem. This study attempted to determine if intersuckling continues after in weaning in calves that demonstrated intersuckling behaviour prior to weaning. It also looked into whether the development of intersuckling is associated with feeding management during weaning. One week prior to weaning and weeks 1, 5 and 9 after weaning, the suckling and feeding behaviour of the calves was observed on 10 different farms. The average age at weaning was 21 weeks. The adequacy of the diets was based on the energy concentration. It was found that 92% of the calves were observed intersuckling prior to weaning. However, the rates amongst the calves were quite variable, ranging from 0 to 24.7 bouts/day. Intersuckling was also seen after weaning and the calves that demonstrated a higher amount of intersuckling prior to weaning were more likely to continue performing this behaviour after weaning. Intersuckling occurred most frequently around feeding time. As feeding duration increased or the energy content of the diet decreased, the rate of intersuckling increased. Calves who had restricted access to feed exhibited the more intersuckling behaviours. Therefore, this study found that intersuckling does occur prior to weaning and preventing the continuation of this behaviour after weaning is possible if the calves are fed a diet that complements with the calves physiological transition from a milk based to a forage/concentrate based diet.