As of Dec. 1, veterinary prescriptions will be required for antibiotics for Canadian livestock. The new federal legislation means big changes and covers everything from beef to bees. It could mean added costs for producers, who must also develop a working relationship with a veterinarian.“Producers are going to have to work with a vet. That is going to be a cost change for them,” said Dr. Keith Lehman, Alberta’s provincial veterinarian.The new rules require the removal of growth promotion claims for antimicrobials used in animal feed. Drugs such as tetracycline and penicillin will no longer be available over the counter.