An animal without ear tag can’t be slaughtered, can’t move from its city, and its breeder can’t take any support from government. Animal identification provides farmers and breeders to register the animal information to the passports such as born, death, movements.
Besides the method changes according to the country, generally national organizations assign the numbers to the ear tag manufacturers. Farms also choose one more way to make a group in a herd or flock by using different colors and numerating system.
An ear tag should be applied by an applicator (plier) from the correct point which is between the muscles of an ear. An animal may be tagged on one ear or both which depends on the ministry of that country.