Abstract: A system for monitoring the time and number of times each cow in a herd is mounted for purposes of determining the most successful time to artificially inseminate cows. The system employs a single hand held receiving unit for remotely communicating with multiple individual recording units secured to the backs of the cattle. The receiving unit can remotely and selectively reset counters contained within the recording units and can remotely and selectively poll the recording units to obtain data on mounting activity for each cow. The data can be viewed on a display provided on the receiving unit or can be downloaded to a computer via a computer port provided on the receiving unit. The recording unit employs a unique switch for sensing mounting activity.