23. A permit holder shall obtain a certificate from a veterinary surgeon to the effect that each bull:(1) has undergone annual tests showing that it is free from:(a) bovine leucosis;
(b) paratuberculosis;
(c) malignant catarrh;
(d) trichomoniasis;
(e) campylobacteriosis;
(2) has undergone semi-annual tests showing that it is free from:(a) brucellosis;
(b) tuberculosis;
(c) leptospirosis;
(3) has undergone quarterly tests showing that it is free from bovine leucosis, if it is younger than 24 months of age.