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  • Effects of injection position and transponder size on the performances of passive injectable transponders used for the electronic identification of cattle


A total of 686 passive injectable transponders (PIT) of two sizes (23 and 32 mm) were injected s.c. in armpit, ear scutulum, and upper lip of 43 calves, by trained and untrained operators. Losses and breakages were recorded monthly until slaughter using different reader types. The number of PIT that fell or broke in the slaughtering line, the location method, and the recovery time were also recorded. Losses were lowest in armpit and greatest using a 32 mm PIT in the lip. Recovery of PIT in the abattoir was on average 96.7, 96.7 and 99.2% for armpit, ear, and lip, respectively. Recovery time was affected by position: the quickest was lip (27s), followed by ear (52s) and armpit (78s). In conclusion, injection of a 32 mm PIT into the armpit showed the best results on the farm, but a longer recovery was needed. Improvement of recovery methodology and time would be necessary in order to recommend injection of PIT in the armpit for cattle tracking.

Additional information

Authors: CONILL C, Universitat Autonoma de Barcelona, Unitat de Produccio Animal (ES);CAJA G, Universitat Autonoma de Barcelona, Unitat de Produccio Animal (ES);NEHRING R, Universitat Autonoma de Barcelona, Unitat de Produccio Animal (ES);RIBE O, JRC, ISIS, Ispra (IT)
Bibliographic Reference: An article published in: Journal of Animal Science, Vol.78 (2000), pp.3001-3009
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