16% of world population is black skin.
20% of world population is white skin.
White women are restricting their families to less children than 20 years ago, so soon there will be more black skin than white skin - and therefore more black bulls to provide the services that white males can't provide.
In the longer term, white skin might disappear off the face of the earth - and so as an endangered species, some sort of organised breeding programme may be necessary to retain white women. Probably 60% of white men will be not allowed to produce children as superior potency sperm will be needed to stop the extinction of the white race.