If you look at Africans I'd wager to a large degree no. They are already very strong over there. Obviously the strongest survived and we're able to procreate with women. The average kidnapped man of African descent died from the work individuals if European descent put him through. Most didn't survive to have children so large breeding farms of individuals, if they existed were not to a large degree Since the return on the investment would take a while to bare fruit.
Friends that were strong and escaped the filth were able to procreate which I feel constitutes a greater portion of the strong individuals u r alluding to, friend.