If the MAIS were to become mandatory, as many people in USDA, NIAA and several other vested interests want, every farm animal must have individual ID, a 15 digit number provided by USDA (the first 3 digits being a country code). For cattle it's supposed to be an ear tag with an RFID chip that can be scanned. For horses, the Equine Species Working Group recommends a microchip implanted by your vet, with the 15 digit number. The NAIS stipulates use of the ISO (International Standards Organization) 134.2 kilohertz (kHz) frequency chips-the type used in many European countries.
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