If that is true then it would significantly reduces the main loss factors such as fox and corvid predation along with problems relating to exposure, injury and disease . Sounds to me like the farmers in Norway provide a far better standard of husbandry for their animals then the crofters you mention which I strongly suspect is the main issue here. Of course instead of implementing proper practice its far easier to to bitch and moan over easy scapegoats with a view to getting even more state handouts
Or it could just be far colder and darker at lambing time in Norway. Eagle Golden clearly knows the area and farmers in question,so perhaps he knows what he's talking about.