© Lars Haugaard, Aarhus University, Denmark

Ruminal Heart Rate/ Temperature Data Logging System (FIWI)

The Research Institute of Wildlife and Ecology (FIWI) developed in cooperation with Vectronic Aerospace a special data logging system for long term measurements of ruminal heart rate and body temperature of free-living ruminants.

The Ruminal Heart Rate/Temperature Data Logging System is an independent device with its own battery. It is compatible with all Vectronic GPS collars with 1D-5D batteries, even incl. Drop Off.

In cooperation with Research Institute of Wildlife and Ecology (FIWI)

Operation Overview:

The main system components of the Ruminal Heart Rate/Temperature Data Logging System are the Ruminal Implant Transmitter (RIT) and the Collar Data Logger. The RIT is placed inside the rumen and records raw heart rate based on heartbeat vibration during low activity periods of the animal and rumen temperature. The heart rate and temperature data are transmitted to the Collar Data Logger inside the battery pack in predefined intervals, using a short-range UHF radio data link.

The download of the stored data sets is possible via direct USB cable connection to the computer or with an additionally available RumiLog Base Station via a UHF data link to the Collar Data Logger.

For the interpretation of the downloaded data files in particular the heart rate values, a special designed filter program (https://rumina.fiwi.at/) free accessible via internet must be used.

Ruminal Heart Rate/ Temperature Data Logging System (FIWI)

Collected data sets

  • raw activity
  • head down time, head up/down changes counter
  • collar temperature
  • body temperature
  • raw heartbeat vibration

Post Processed Data

  • ruminal heart rate
  • temperature
  • processed activity data
  • csv formatted

System components:

  • stainless steel/ceramic tube
  • highly sensitive acceleration sensor
  • digital temperature sensor
  • Dimensions: length 68 mm, Ø 19 mm, weight 75 g
  • Heart Rate:
    • scan time 180 s
    • scan interval 6, 9 or 12 minutes
    • detection range 15…150 beats/minute
  • Temperature measurement:
    • interval 180 s
    • range 0…50 °C
    • resolution 0.0625 °C
    • calibrated accuracy 0.1 °C
  • Lifetime: 1-3 years, depending on configuration
  • Wireless UHF data link: transmission interval 180 s
  • integrated in the collar’s battery pack
  • synchronizes automatically with its corresponding RIT
  • data stored in the onboard nonvolatile memory
  • data download via
    • via USB cable connection to windows program RumiLog
    • via UHF data link to RumiLog Base Station
  • Measurement interval: 180 s
  • Activity measurements:
    • animal activity
    • head down time
    • head up/down changes counter
    • Temperature measurement
      • resolution 0.0625 °C
      • accuracy 0.5 °C
    • Storage capacity: 64 MByte
    • Lifetime: 2-4 years, depending on configuration
  • USB powered
  • communication range:
    • up to 200 m with UHF YAGI antenna (optional)
    • only short distances with whipped antenna
  • Function:
    • switch the RIT On/Off
    • check RIT function
    • download status and data from collar data logger
  • free Windows software:
    • direct connection with Collar Data Logger
    • direct connection with RumiLog Base Station
    • for data download and change of settings
  • https://rumina.fiwi.at/
  • upload of raw heartrate data
  • result: post processed data of ruminal heart rate (csv formatted)