semenental value 

Treasured or revered for its ability to fertilize the egg of a female, or in memory of said ability.

Lewis and Clark brought along a large muscular African-American fellow as one of their traveling-party on their expedition out West, and said chocolate-skinned behemoth proved to be of great semenental value to the group in many of the Native villages that they passed through --- wherever they stopped, multiple squaws would often literally line up to be impregnated by said husky and virile dude, in hopes of raising huge strong-bodied sons of their own from this "fresh blood" infusion.

semenental value by QuacksO October 25, 2019