Why Beefalo... for the Feeder?

The experiments conducted by Canada from the early 1900's to the late 1940's all indicate that Bos X Bison had a better conversion of roughage feeds compared to Bovine. This data hasbeen pretty well accepted by cattlemen and scientists alike, but it always has been assumed that Bison and Bovine had similar conversions for grain. However the Koch study cited in this previous post reported that Bos X Bison had higher feed cost for Beefalo even if a normal ration is fed. However, for best results the feeder should feed a higher roughage ration to Beefalo to keep the feed intake up.