(1) Due to the quality of the ear tag, the binding force of the main and secondary tags is low;

(2) Unqualified raw materials (poor antioxidant capacity, fast aging);

(3) The method of wearing ear tags is not standardized;

(4) The position of marking is not accurate;

(5) There is no disinfection during marking, and mosquito and fly bites in high temperature environments cause inflammation, resulting in label dropping.