Disclosed is a cattle marking and identification ear tag of the type that combines a male part and a female part. The tag includes a label and an essentially cylindrical or frusto-conical button (3) which is secured to an eyelet in the label so that the base (5) of the button abuts against the edge of the eyelet, the contact surfaces having a complementary shape. The base of the button includes at least one reinforcing rib (6). The button is provided with reinforcing elements such that the label cannot be detached from the button at the eyelet using a cutting instrument without leaving visible traces of attempted forgery of the tag.
