They purchased a 15/16 Charolais bull, “Snowball,” based upon the bull’s performance records, from Clint Ferris of Tie Siding, Wyoming for $900 in 1954. A friendship with M.G. “Maxy’ Michaelis and later Max III and Sharon Michaelis, of Kyle, Texas and Coahuila, Mexico, brought linebred original Jean Pugibet Charolais stock, imported from France to Mexico in 1930-33, to the Cobb Ranch in Montana. Every Cobb animal traces his or her lineage back to this special foundation herd.
A link to “Inbreeding in Cattle” by Dr. Sally Northcutt and colleagues of Oklahoma State explains the practice of using this linebreeding method thoughtfully: https://pods.okstate.edu/fact-sheets/ANSI-3165pod.pdf” All inbreeding does not result in disaster when the use of inbreeding centers on genetically superior individuals. Linebreeding is probably the best known use of inbreeding. Linebreeding is an attempt to maintain a high relationship to some outstanding ancestor while keeping inbreeding as low as possible.” p.3165-4. Linebred animals offer the most consistency for desirable traits, especially when used for crossbreeding or outcrossing.