An ingestible bolus for automatically monitoring location and physiological parameters including core temperature of ruminant animals. The location parameters are determined using magnetic field information and/or GPS data sensed by the sensors in the bolus and communicated along with a unique ID number and time stamp to a centralized location. A data center at the centralized location comprises a computing environment for analyzing the data received from the bolus and transfer the analyzed results including animal temperature, location to a user interface display. The temperature information is analyzed at the data center to determine the health status of the animal.
