Certainly in Denmark they did have some trouble, especially with their weaner pigs to begin with. Those are pigs that are just leaving their mamma and eating on their own. It took the Danes about six to nine months to figure out what they could be doing instead. They are trying very diligently to keep down the amount of antibiotics they are using, but, as has been pointed out by others here, it isn't just the amount of antibiotic but how you are using it. If you use a very low level all the time, it would be like feeding your children antibiotics with their breakfast cereal every morning to make sure they don't get disease later on.
On March 8th, 2011. See this statement in context.