1.   Drug use has emerged, with some teens sniffing substances and smoking marijuana, which grows wild in Bhutan and traditionally is used as pig feed.

2.   Now that material has been diverted to chicken and pig feed and pet food.

3.   Strong prices and ample supplies of corn -- the primary ingredient in pig feed -- made pork production profitable earlier this year.

4.   Along the roads, sweet potato vines are strung up to dry for pig feed.