(3) Save where otherwise prohibited by law, and notwithstanding anything in this Act, a farmer who is not a registered person, or an employee of the farmer acting in the course of his or her duties who is not a registered person, may carry out a treatment or procedure on, or administer an animal remedy to, an animal owned by the farmer provided that carrying out the treatment or procedure on, or administering the animal remedy to, the animal is incidental to the usual care and management of that animal.