Korea and Japan, both montainous, lacks widespread tradition of pastoralism, while in Europe mountainous areas (Balkans, Alps, Carpathians) unsuitable for farming often are used as pastures. Seems, that difference has its origin in culture rather than environment. In Europe, for example, Vlach shepherds spread pastoral lifestyle to Western Carpathians, all the way to Moravia. Previously inhabitants of Western Carpathian chain made use only of valleys, were farming was possible, seeing steep mountain slopes as useless. After Vlach migration things changed, and these mountainous areas, not used by farmers, were turned into pastures. Would pastoralist culture appear in Japan, then IMHO similar proces would happen and areas at elevations too high for farming may be used as pasture for sheep and goats. What PoD is needed for this (perhaps earlier introduction of sheep to the region?) and what would be impact (other than deforestation)?