Red, considering you have a lesser butter, its offspring have now been muddied to the point you can no longer distinctly declare one a lesser and another a butter. Leading to an asterisk next to your animals, which can no longer clearly state a line distinction.

While you may engage in ethical behavior by disclosing this to customers, others may decide to not do so and sell one at a higher price because the name itself holds value in someone's eyes. The end result is further confusion.