[Labeling, defects, possibilities--animal welfare in the identification of animals]

Marking is necessary not only for handling animals, but also because of animal welfare. The method itself, however, can sometimes reveal deficiencies concerning protection of animals. These deficiencies are presented and discussed. In this context, the new electronic identification system--based upon implantable microchips--is considered. It is judged upon as particularly positive compared to other methods. Ideas are presented regarding special fields of application.