Remote-controlled droids herd cattle on the American Great Plains for agribusiness giant Cargill Inc. Robots prep shipments and stack pallets at meatpackers’ plants from coast to coast. And with poultry heavyweight Wayne-Sanderson Farms deploying one set of machines to vaccinate in-egg chicks at the start of their lives and another to eviscerate them several weeks later, US meat processors might look at first glance as if they’ve successfully pivoted from man to machine in one of the world’s mos...