Today in the industry there are certainly drugs licensed for use as growth promoters. In theory, yes, producers are using those drugs according to the label put on by the VDD. In general, our experience from the EU situation has been that although it is termed “growth promotion”, in general what the drug use is doing is suppressing subclinical disease that without that antimicrobial exposure would lead to explosive clinical outbreaks that not always, but often, would require further antimicrobial therapy.
So yes, there are drugs licensed for that in Canada as we speak.