Officialy it's forbidden to cut open the throat of those sheep and let them bleed to death. Law requires an animal to have minimal sufering before death.
But it was tolerated (i.e. freedom of religion). But this turned out pretty bad. People living in flats complained about the blood dripping down from above because the sheep were killed on the balcony! So the Dutch authorities now only allow it in islamic slaughterhouses.
This also to comply with the regulations on meat consumption.
In Germany it is the same situation.
So, kosher slaughter is forbidden now in Holland and Scandinavian countries. Funny thing, there is now a thriving kosher food industry in Russia, where all such things were formerly prohibited.
Russia is looking better and better.