No guess whose standards #45 wants to adopt. Allow rbST, U.S. sitting on 105,000 tonnes dry milk powder they have to dump some where. U.S. farmers used 29.1 million lbs of penicillin and tetracycline as growth promotants in 2014. They subsidize dairy to the tune of $19.12 BILLION over 10 years.
They have a five to one advantage under NAFTA rules.  In the 1980's they had 3 million dairy farms by 2014 they had 48,000.
I'll drink Canadian milk, thanks.