All in the Family by Greg Baker

The cattle in Texas are a unique blend of stock but still all in the family.  Somewhere in Mexico in the 1500s, cattle from Spanish stock meandered north to graze. They had longer horns than most cattle, often spanning six feet, and were lean bordering on bony. As they wandered across the frontier, they met sturdy, speckled-coated British-bred cattle moving west from the eastern U.S coasts. Nature took its course, and by the 1800s, a new breed of strong, hardy, disease-resistant Longhorn cattle roamed the Texas frontier by the millions.