The invention relates to an ear tag element for tagging animals and to methods for producing it. The ear tag element according to the invention comprises a body (1) and a transponder (4) which is embedded in the said body, the transponder having a chip and an antenna which are connected to one another, and the body of the ear tag element comprising a rigid part (2), a flexible part (3) and a boundary surface (6) between them. The oar tag element according to the invention is characterized by the fact that at least the antenna of the transponder lies in the boundary surface, in such a manner that the antenna on at least one side bears against the rigid part and on at least one other side bears against the flexible part of the body.