10 A sensor collar containing sensors for cows for medical use to gather cow biometric data relating to animal heat, behavior, health, wellness, animal movements, steps, rest and rest bout for the purpose of detecting estrus condition, low activity, calving and prolonged calving, and group stress; a cow collar containing a sensor for medical use for gathering cow biometric data relating to calving birth alerts, animal respiratory behavior information, and lameness detection, all the foregoing for medical purposes; a cow neck collar sensor for medical use for gathering cow biometric data relating to animal behavior, wellness and health, namely, estrus condition, low activity, calving and prolonged calving, and group stress, and transmits the data wirelessly to a computerized central system; a cow collar sensor for medical use for gathering cow biometric data in the fields of Ecoli mastitis, ketosis, acidosis, rumen problems, foot problems, pneumonia, cystic cows, detects rumination as a means of identifying sick animal, respiration rate and panting indication, and monitors for identifying health conditions such as heat stress; a neck sensor collar for cows that gathers biometric data relating to chewing, licking, ruminating and full body activity, heat detection, detection of non-cycling and repeatedly cycling cows, fertility management, animals for insemination, sick animals, lame animals, animal in heat stress, rumination as well as panting