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 fo...