20. A semen collection permit holder shall, before admitting a bull to an establishment where activities are carried out under permit, obtain a certificate signed by a veterinary surgeon to the effect that:
(1) in the case of a breeding bull, it is free from any defect of the genital organs or any hereditary disorder that is visible, known to him or that he suspects;
(2) within 30 days before its admission, the bull had undergone tests proving that it was free from:
(d) malignant catarrh;
(f) bovine leucosis;
(3) the herd from which the bull comes is free from any clinical sign of infectious disease.