39. The general health of animals the keeping of which is authorized under a licence belonging to any of class 2 to class 5 must be assessed visually by a veterinary surgeon1° at least once a year, in the case of a class 2 licence;
2° at least once every 6 months, in the case of a class 3 licence;
3° at least once every quarter, in the case of a class 4 licence;
4° at least once a month, in the case of a class 5 licence.