Thirty-nine of the 47 registered Beefalo whose genomes were sequenced carry no detectable bison ancestry, including the foundation bull that sold for $2.5 million in 1975 and whose pedigree recorded him as more than a third bison - Space Daily

The American Beefalo Association defines the breed as three-eighths bison. A genome-wide survey of frozen semen, drawn largely from animals collected at or near the founding of the breed, found that not one Beefalo in the data set meets the standard, and foun…