42It follows, lastly, that the computerised database of the system for the identification and registration of animals is designed to ensure efficient tracing in real time of those animals, which is essential for public health reasons (Maatschap Schonewille-Prins, paragraph 50). Accordingly, the database is required to be fully reliable. As a consequence, that database alone is able to confirm the fact that the conditions governing eligibility for the aid in question are met, such as those relating to the density of livestock.