This is very obviously a coming-of-age ritual, probably signaling the transition from childhood to maidenhood. It is thus analogous to the Pony Cutecenera.

Yak bullcalves probably have an analogous ritual.

6530461
I wouldn't be surprised!

Though at least you shouldn't have to go crusading for your hair braiding, at least.

--Sweetie Belle

6530461 It would certainly seem to be that way. And that begs a question:

Yaks appear to draw inspiration from Nordic cultures like the vikings and the Mongolians. Did either of those civilizations have ceremonies to signify the passage from childhood to adulthood?