I do not understand A2A2. I have found below:
https://www.sciencedaily.com/releases/2013/03/130325160514.htm...Among the findings was that the Texas Longhorn breed are direct descendants of the first cattle in the New World. The ancestral cattle were brought over by Columbus in 1493 to the island of Hispaniola. They traveled the rest of the way to the continent in 1521 on the ships of later Spanish colonists....
...The study reveals that being a "pure" descendant of cattle from the Iberian peninsula indicates a more complicated ancestry than was understood. Approximately 85 percent of the Longhorn genome is "taurine," descended from the ancient domestication of the wild aurochs that occurred in the Middle East 8,000-10,000 years ago. As a result, Longhorns look similar to purer taurine breeds such as Holstein, Hereford and Angus, which came to Europe from the Middle East.
The other 15 percent of the genome is "indicine," from the other ancient domestication of the aurochs, in India. These indicine cattle, which often have a characteristic hump at the back of the neck, spread into Africa and from there up to the Iberian peninsula....