© Lars Haugaard, Aarhus University, Denmark

Vaginal Implant (VIT)

The VIT is used to observe the pregnancy and the partition of a GPS collared female ungulate. The VIT informs the researcher about the date and location of the calving site and provides physiological data during the whole pregnancy. It measures and optionally stores the temperature and motion (user definable parameters) and defines its status (in-situ or expelled). The VIT transmits this data with its unique ID to the collar which will initate the alert notifications in case of birthing event or separation. We offer 2 different sizes suitable for medium (e.g. deer) and big-sized species such as moose.

Birth detection: When the VIT is pushed out of the mother’s body, two things are expected to happen: the temperature around the VIT will most likely drop and the motions will stop. When this happens, the VIT will send a birth event message to the VERTEX Plus collar which will conduct an unscheduled GPS fix and send an alert notification to the researcher (if the collar is equipped with a remote communication option).


Separation: The VIT continuously transmits an ID code on a UHF frequency to the mother’s VERTEX Plus collar. When the mother moves away from the calving site, the ID signal is not received any longer. The VERTEX Plus collar will send a separation message after one hour has passed without detecting the ID signal.

Localisation: To locate the calving site, the VIT is equipped with a VHF beacon transmitter. The VHF can be programmed as flexible as the one in the GPS collar.


Vaginal Implant (VIT)



  • Reproduction: Find the calving site and observe the time directly after birth. How long does the mother stay close to the calving site?


  • Reproduction 2: Collar the offspring and observe the mother – offspring behaviour and development of the calf.


  • Physiological data: Combine GPS, activity and the detailed temperature values of the VIT and get a fine scaled picture of the pregnancy.