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Abstract. Modern hog production is generally limited by the amount of thermal stress that an animal can reasonably tolerate. Skin temperatures between sows under similar heat stress conditions can vary greatly. While respiration rates and rectal temperatures have a stronger correlation, they require significantly more manpower to measure and record for research studies, and they are impractical to collect for large commercial operations. Current devices for measuring the internal temperature of an animal are either passive devices that require personnel to measure each animal individually by applying a wireless power source momentarily to the skin or are battery-powered devices that record the temperature at regular intervals, but must be retrieved before the data can be accessed and analyzed. Researchers at Purdue University have developed a vaginal device to address the shortcomings of both of these current types of devices. The new body temperature sensing device automatically transmits the internal temperature of the sow to a central data computer at regular intervals, so that real time decision making can occur. With this device, large-scale data collection is feasible with a modest-sized farm staff. This document details the current design of the device and developmental tests that have been performed so far.