A system for ascertaining the mass of an animal having attached thereto a radio frequency identification (RFID) tag. The system comprises a scale for supporting the animal and generating mass information indicative of the mass of the animal when so supported. The system comprises a RFID reader for interrogating the RFID tag which when interrogated generates a RFID tag signal from which the RFID reader can derive animal identification information indicative of the identity of the animal.
