Only a small number of carriers were identified over the hundred-year span from the early importations until they were accepted into the Canadian and American herd books in 1969 and 1970, respectively. Most of the early accounts of red calves being born to black and white parents were never documented. A few stories of "reds" born to elite parents persist over time, as there is a tendency to credit the ancestor with the highest (closest) relationship to a red-carrier animal as the one that transmitted the trait, whereas sometimes it is the other parental line that has passed it on, even though the ancestor responsible may have entered the pedigree several generations earlier.