Grazing two or more types of livestock in the same pasture is nothing new. Farmers and ranchers 100 years ago (and for centuries before that) usually had cattle and sheep, and sometimes goats or horses, all in the same pastures.
In the past 80 years, farming became more specialized; most stockmen raised just cattle, sheep, or goats. But recent years have seen a move back to multispecies grazing, for many reasons. Several enterprises (rather than just one) can be more profitable and sustainable.