Gunrock covered a total of 476 mares during his career at stud, some owned by the university, and the rest from varied farms across northern California.

[1] In 2022, the students of UC Davis voted to replace Gunrock the Mustang with a dairy cow after the "#Cow4Mascot" and "#AggieMOOvement" social media campaign, organized by Mick Hashimoto, a third-year applied statistics and economics double major at the university.

[7] Hashimoto claimed that the students voted to oust Gunrock the Mustang in 1993, but that the school administration and then-Chancellor Theodore L. Hullar rejected the decision.

[3] However, UC Davis Chancellor Gary S. May and the Cal Aggie Alumni Association (CAAA) rejected the mascot change proposal, declaring that the school would not be moving forward with it.

The dam of Gunrock, the stakes race mare Gunfire, was sired by Hastings (1893–1917), an American Thoroughbred racehorse and stallion foaled in Versailles, Kentucky, and bred by Dr. John D. Neet.

Of his offspring, the most notable are stakes race winners Gunfire, Field Mouse, Masterman, and Fair Play, sire of Man o' War.

Gunrock was 4x5 linebred to Springfield (1873–1898), a successful English Thoroughbred racehorse that won 14 consecutive races and was a useful sire of the late 19th century.

Some of his descendants include, but are not limited to: One of his male-line grandsons through Little Pebbles, Paco (1941), was exported to Uruguay in South America, where he sired the Thoroughbred stallion Adalid (1956), who had issue.

2012), was exported to Belgium to stand stud and produce Zangersheide and Belgian Warmblood sport horses and show jumpers.