Iowa State University researchers used 120 feedlot steers to evaluate a rumen bolus identification system during a 130-day period. The boluses were placed in the reticulum using a balling gun. A panel antenna was located on the left side of a hydraulic restraining chute placed on load cells and connected to a Tru-Test scale indicator to display and store the electronic identification number and weight of the steer. Once displayed on the indicator, the identification number and weight were stored in a file in the indicator which was later downloaded as an Excel file. All of the boluses were retained by the steers and all remained functional. The system was highly accurate, recording the information for 711 of the 720 times the animals were weighed for an accuracy of 98.75% (Trenkle, Allen. 2006. Iowa State Univ. Animal Industry Report).