What specific parent pairing defines a true zorse, as opposed to a hebra?

Answer

A male zebra with a female horse (mare)

The precise naming convention for the zebra-horse hybrid distinguishes the offspring based on the gender of the contributing parents. A true zorse results specifically from the cross between a male zebra and a female horse, often referred to as a mare. If the parentage is reversed, meaning a female zebra is crossed with a male horse, the resulting hybrid is technically classified as a hebra. Although convention frequently ignores this distinction in casual conversation, applying the term zorse universally, the technical definition relies on the male zebra being the sire to the mare.

What specific parent pairing defines a true zorse, as opposed to a hebra?
biologyanimalhorsezebrahybrid