The invention relates to a cattle marking and identification ear tag of the typethat combines a male part and a female part, including a tag and an essentiallycylindrical or frusto-conical button which is secured to an eyelet in the tag,such that the base of the button abuts against the edge of the eyelet, the contactsurfaces having a complementary shape. The ear tag is characterised in that thebase of the button includes at least one reinforcing rib. The button is providedwith reinforcing elements such that the tag cannot be detached from the buttonat the eyelet using a cutting instrument without leaving visible traces of attemptedforgery of the tag.
