Keepers of cattle must order eartags from one of the Defra approved eartag manufacturers.
Defra approves eartags on behalf of the UK. The manufacturer will notify the Governments Eartag Allocation System (ETAS) of the order and will then be allocated sequential numbers for each tag.
The sequential numbers are based on the keepers individual herd mark which is then cross referenced to the unique farm code (CPH)
Keepers should limit their orders for eartags to a maximim of one years supply.