You have just answered the query in the back of my mind.............fishtail teats are common in Boers.....it is said that some strains actually have 4 working orifices. Whether this is due to a connection with some of other breeds in Africa who are prized for 4 teats....this connection would go back 200 years or more.....I dont suppose it is known.
I had assumed we were discussing a swiss type breed where of course fishtail teats are a no no.......but in Boer/Boer crosses, this can crop up.