21. Refusal and revocation of licences.

(a) of a defective or inferior conformation and consequently likely to beget defective or inferior progeny, or
(b) suffering from an incurable, contagious, or infectious disease or from any other disease rendering the bull unsuitable for breeding purposes; a
(c) of a breed which it is undesirable to propagate in the area in which it is kept.
(a) the licence was granted under circumstances of which the Veterinary Officer was not aware at the time of granting the licence, or
(b) there has been a breach of the terms and conditions of the licence: