RFID electronic ear tag with handheld and fixed card reader form an individual sow management system that automatically identifies pigs with a recognition rate of more than 95%. Simple and fast uploading of the data record of the pig's position change via the card reader, increasing the efficiency of the transfer by 80%. The complete identification information of pigs can be retrieved in 1 second by the card reader, with 0 reading error, realizing the business input accurately.