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Subcutaneous electronic identification in cattle: a field study.

T Løken¹, G Vatn, E Kummen

¹Norwegian School of Veterinary Science, PO Box 8146 Dep, 0033 Oslo, Norway. torleiv.loken@nvh.no

The Veterinary Record

|August 5, 2011

Summary

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Injectable electronic transponders for cattle identification show high success rates. Most transponders implanted in the ear base remained functional for up to 30 months, with no adverse effects on calf welfare.

Area of Science:

Veterinary Science
Animal Identification Technology

Background:

Electronic identification systems are crucial for livestock management.
Injectable transponders offer a minimally invasive method for animal identification.

Purpose of the Study:

To evaluate the long-term efficacy and safety of injectable passive electronic transponders in cattle.
To assess transponder functionality and animal welfare over a 30-month period.

Main Methods:

652 calves were subcutaneously injected with polymer or glass-encapsulated transponders in the ear base or earlobe.
Animals were monitored weekly for clinical signs and pathological changes.
Transponder signal detection was performed at multiple intervals up to 30 months post-injection.

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Main Results:

No significant clinical or pathological changes were observed in the calves.
Transponder migration did not occur from injection sites.
At 8 months, 98.2% of ear base and 90.5% of earlobe transponders were functional.
Functionality rates at 30 months were 97.4% for ear base and 89.6% for earlobe transponders.

Conclusions:

Injectable transponders are safe and effective for cattle identification for up to 30 months.
Ear base implantation demonstrates superior long-term transponder functionality compared to earlobe implantation.