Start with a three generation sire stack of the greatest marbling bulls to ever leave Japan, 068, Michifuku and Itoshigenami. Add in a powerful dam by Itoshigefuji (TF147) for growth and frame and top the pedigree off with a son of the breed leading maternal traits sire, Itomoritaka (002). Finally, a grandson of Misaki whose marbling MVP was 1.01 and a great-grand son of Misako whose marbling MVP was 1.03. The exciting result is a tested recessive clean young super sire with a AA-10 score for SCD and tenderness.
A research paper featured in the October 2014 issue of Animal Frontiers providers some additional insight into how the genetic makeup of an animal such as Macho can lead to excellent marbling (specifically p. 51, Growth Hormone paragraph).
