The use of growth-promoting antibiotics in hog farming can weaken their effectiveness in treating humans because such use can spread resistance to those antibiotics among microorganisms  But now the Smee Company, one of the largest pork marketers, may stop buying pork raised on feed containing these antibiotics  Smee has 60 percent of the pork market, and farmers who sell to Smee would certainly stop using antibiotics in order to avoid jeopardizing their sales
So if Smee makes this change, it will probably significantly slow the decline in antibiotics' effectiveness for humans
The decline in hog growth due to discontinuation of antibiotics can be offset by improved hygiene.