ASI Discusses New VFD Protocol at 2017 Convention

If the grain and other sheep food you feed your flock have contained these antibiotics in the past, or if you've added antibiotics as supplement to your flock's food supply, you don't necessarily have to change what you feed your flock. Those drugs that shepherds have traditionally used will still be available in the United States ... the new rule simply requires that you obtain a written VFD order from a local veterinarian to continue feeding your flock as you have in the past.
If you don't supplement your flock or add antibiotics to the food or water your sheep consume, this rule won't affect you.