In livestock records, "309 RAR" (often seen as or Eveready 309 RAR ) refers to a notable bull from the Mustang Angus Ranch or similar pedigree databases [12].

: You will frequently find this identifier in cattle sale catalogs (such as the "Power on the Plains" Bull & Heifer Sale) where the animal is listed as a sire or part of a genetic lineage [12]. Other Occurrences

: These records are used to track Expected Progeny Differences (EPDs) , which help ranchers predict traits like birth weight, growth rate, and docility in offspring [12].