Some source augmentation regarding African-American slaves working with cattle during Colonial times from the book, "Slavery In North Carolina, 1748-1775" by Marvin L. Micheal Kay and Lorin Lee Cary:
"... If North Carolina shipped out substantial quantities of barreled beef and pork, as well as livestock products such as butter, cheese, lard, and tallow, these too went overland to Virginia and South Carolina. And finally, starting in the 1750s cattle drives extended as far north as Pennsylvania and New Jersey, and hogs were regularly driven to Virginia."