An article of the Bhutan Observer cites a PhD study of the Royal University of Bhutan that has found an alarming decline in the population of the indigenous pigs.

Bhutan’s indigenous pigs or saphags have social, cultural, and economic importance to the livelihood of many Bhutanese rural poor households. "The study says that indigenous pigs are hardy and resistant to many diseases. They are highly adaptable to a broad range of environments with low inputs. These traits, the researcher said, are extremely important to respond to climatic and environmental changes and human needs." Indeed, the Bhutan government’s initiatives to improve pig production are mainly focussed on the introduction of exotic breeds.

See the full article here: http://www.bhutanobserver.bt