The herdsman is castrating the lamb in snowy weather, photo from Xinhua, May 7.

Every year, the herdsmen will choose an auspicious day as the "castrate lamb festival" in early spring to help the newly born lambs be castrated. This custom has lasted for thousands of years on Northern-Tibet plateau.

A Tibetan child is holding a little lamb, photo from Xinhua, May 7.

The local herdsman is making mark on the ears of his lamb, photo from Xinhua, May 7.

The flock of sheep runs out of sheep-pen, photo from Xinhua, May 7.