A yellow ox in Bijie, Guizhou Province, recently spit up two large gallstones, worth about 40,000 yuan ($6,408), Shenzhen Evening News reported on Thursday. The stones, known as calculus bovis, are very valuable in traditional Chinese medicine.

The animal's owner, surnamed Yang, bought the ox for 3,000 yuan a year ago. On October 29, Yang was herding the ox, which had been ill, when it suddenly spit up two odd-looking stones, each weighing about a half a kilogram.

Yang took them to Bijie Hospital of Traditional Chinese Medicine on November 4. Several doctors agreed that they were calculus bovis, worth 40,000 yuan.

"When I saw that my ox had become so weak after such an investment, I thought I'd lost out. But now, I have gained a fortune, " Yang said.

Shenzhen Evening News