This article describes the effectiveness of electronic ear tags placed in 625 sheep and 508 4-H swine projects in five Indiana counties. Electronic ear tags worked well (>98% readability) in lambs when the tags were properly placed on the inside of the animal's ear. Electronic tags were either missing or failed to respond in 33% of the 4-H hogs at the Knox county fair, and swine members had a difficult time visually reading the number on the tags. Electronic ear tags speed up the check-in of animals at the county fair and reduce the potential for human error in transposing numbers.
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Rusk, C. P. (2002). Electronic Identification of 4-H Livestock Projects. The Journal of Extension, 40(6), Article 11. https://tigerprints.clemson.edu/joe/vol40/iss6/11