According to your glossary, antimicrobials are all products having antimicrobial activity. At the level of the European Union, politicians have taken legislative control away from the veterinarians. We are not theoretically responsible for knowing which antimicrobial growth promoter is present in foodstuff. We could therefore set off interactions between products. Despite existing legislation, veterinarians must keep themselves aware of everything that is administered to the animals they examine.
All antimicrobial use is recorded.
Companies that manufacture these products are required to keep very detailed records of the quantities of antimicrobials that they include as growth promoters as do farmers who produce their own feed. As regards your second point, it is more a question of semantics than actual beliefs. There is confusion as to the distinction between feed additives, feed additive antimicrobials that are licensed for use as growth promoters and antimicrobials that are used for therapy, but which can be included in feed under veterinary direction. Antimicrobial growth promoters account for a very small portion of total antimicrobials used. I do not know what this implies.