My immediate reaction would be to look into the EU, specifically under their farm to fork strategy, at what evaluation process they may be using in order to make sure that this feed gets to market as quickly as possible.
Whether it can be considered more of a feed approach as opposed to a veterinary drug here in Canada would be a really great place to start, as well as making sure that cattle feed from other potential approaches are evaluated here as well. There's news, for example, about red seaweed cattle feed additives that may have a reduction per cow.