Relationship of electric power quality to milk production of dairy herds - Field study with literature review

► Dairy cows were sensitive to earth currents from neutral-to-ground circuit outlets. ► Clamp-on ammeters on grounded-Y down grounds give quick current readings. ► Harmonic distorted voltage affects cows' behavior, health, and milk production. ► Peak-to-peak current must be measured for full impact of current on production. ► IEEE standards should include harmonic current effects on human and animal health.