Also there's less need for it in the first place as welfare conditions are usually better. Who could have expected that livestock that's not kept unhealthy conditions tends to be healthier.
No doubt; same in Netherlands (more pigs than people in the country). But there's been improvement over the last 20 years on the animal welfare front, at least in the Netherlands and presumably Denmark too. And routine administration of antibiotics is banned everywhere in the EU now, AFAIK without too many exceptions.