What is a likely evolutionary reason why female takin retain heavy horns despite lower reproductive competition than males?

Answer

They provide a crucial survival benefit related to defense against high predation risk.

The retention of horns by females suggests the risk of predation on the entire group, including females and calves, is high enough to justify the energetic investment in defensive structures for all adults.

What is a likely evolutionary reason why female takin retain heavy horns despite lower reproductive competition than males?
femalehornTakin