What are thoroughbred breeding costs called?

The thoroughbred breeding costs are typically called stud fees.

Here's why:

* Stud: This refers to a male horse used for breeding purposes.

* Fee: This is the payment made to the owner of the stud for the right to breed a mare to their horse.

So, when you're talking about the cost of breeding a thoroughbred, you're essentially referring to the stud fee charged by the stud farm.