20. (1) Notwithstanding anything to the contrary contained in any other law for the time being in force, no one, other than a registered veterinary practitioner, shall be competent to hold any veterinary appointment in a veterinary institution, hospital, dispensary or abattoir maintained or aided by the Government or any local authority. (2) Notwithstanding anything contained in any other law for the time being in force, no certificate required by any such law to be signed by a veterinary practitioner shall be valid unless it is signed by a registered veterinary practitioner. (3) No person shall be entitled to recover any fee or nichargeany Court for any veterinary advice or attendance, or for the performance of any operation, or for any medicine supplied, unless he shall prove upon the trial that he is a duly registered veterinary practitioner.