US Patent 10231644 Calf bolus

An animal monitoring device configured as a bolus for oral administration to reside in the reticulorumen of a ruminant animal. The animal monitoring device includes a memory element, a processor in communication with the memory element and a computer code contained in the memory element. The computer code includes a power management module executable by the processor to regulate power use by the bolus based on determination of remaining energy stored in an energy source and the determined power requirements over a pre-determined life cycle of the bolus.