|Image from Beefalo Australia|
One downside to this, and I suppose to the entire western ranching industry, is that the wild Bison herds have become genetically polluted over the decades. Many of the wild Bison have Cattle DNA in them, and could actually be termed hybrids themselves because of it. This is due to the general land overlap between the ranches and Bison ranges, and due to the fast recovery of the Bison in the last few decades, after they were nearly driven to extinction.
Thanks to Ashley for the suggestion!