9 Downloadable computer software program for processing the data collected from hardware being motion sensors placed on cows' legs; scientific, electronic, optical, weighing, measuring, signaling, supervision and teaching apparatus and instruments in the nature of computers and electronic sensors for monitoring animal movements, steps, rest and rest bout for the purpose of detecting estrus condition, low activity, calving and prolonged calving, and group stress for use in dairy farms, for research use; data processing apparatus and computers; downloadable software used as dairy herd management tool for dairy farm managers; dairy herd computerised management systems for controlling herd health and fertility of dairy cows, used to gather and analyse data on dairy herd health, behavior, wellness and activity for individual cows and cow herds, and also provide health alerts, estrus detection alerts, and calving alerts, all of the foregoing for research purposes, comprised of a cow leg tag that is a wireless networking RFID reader and wireless networking transmitter with electronic sensor incorporating an accelerometer, a wireless remote reader with antenna, receiver and microprocessor, a central identification control unit, a central control unit, a personal computer and recorded computer software for processing and analysing the collected data; computerizing systems comprising wireless networking RFID reader using radio frequency, and a computer unit for controlling, handling and managing dairy herds; Scientific machines and machine tools, namely, sensor tag for sensing movement, steps, activity level, estrus condition, rest time, rest bout, calving, prolonged calving, for scientific use; a leg tag sensor that provides animal identification for milking parlors and over-crowding and bedding alerts, not for medical purposes; parts and fitting for the aforesaid goods, namely, motion sensors