Evaluation of a Physical Ergonomic Intervention for Milking Parlor Operatives - A Case Study

Musculoskeletal pain and disorders frequently occur among milking parlor operatives on dairy farms, irrespective of the farm size and despite that the work is carried out in an upright position. The objective of this case study was to assess the effect of a new milking system, a physical ergonomic intervention, to reduce the prevalence of musculoskeletal pain and disorders among milking parlor operatives. The new milking system has a reduced cluster weight and single tube guidance and, consequently, abandons the positioning of the cluster underneath the udder, thus reducing the postural load. In a pre/post treatment study the parlor operatives of five farms were questioned, and parlor specifics were measured. The gap between visits was at least one year. There was no significant reduction in pain, but three-quarters of the workers experienced a workload reduction and would recommend the new system. The isolation of the effect of the ergonomic intervention was not possible, because all but one farm completely rebuilt their milking parlors, and several things were changed including work organizational aspects. The expected reduction in pain in the musculoskeletal system was noticed, but not statistically significant. Worker satisfaction and participation in decision making could be improved on the farms and might increase the effect of the intervention, especially because work satisfaction is correlated with the occurrence of pain in the musculoskeletal system.