Antimicrobials have been widely used in livestock since the 1950’s. Food animal production has steadily increased over the years, requiring better disease management on farms. More than 75% of antimicrobials in Canada have been used sub-therapeutically in farm animals to prevent disease and for growth promotion. Antibiotic use is beneficial for the agricultural industry because it improves carcass quality, improves feed efficiency, and positively impacts the animal’s welfare by preventing infection and treating disease. However, the public are concerned about, and seek elimination of, antibiotic use in livestock, particularly for growth promotion, because of the increasing global issue of antimicrobial resistance.