In order to offer the consumer the greatest possible transparency, a comprehensive labelling system provides detailed data on egg origin.

This is how KAT eggs are labelled in Europe:
The lawmakers decided that from 1 January 2004 all eggs in Europe had to be identified with standardised labelling.
The labelling consists of three character strings, as in the following example:
1-DE-1234501

The first figure represents the form of rearing:
0 – organic rearing
1 – free-range rearing
2 – floor rearing
3 – cage rearing