California Code, Business and Professions Code - BPC § 19406

(a) A “California-bred horse” is a foal dropped by a mare in California after being conceived in California and remaining in California until the foal is weaned.

(b) A “California-bred thoroughbred” is a horse dropped by a mare in California after being conceived in California, or any thoroughbred horse dropped by a mare in California if the mare remains in California to be next bred to a thoroughbred stallion standing in California. If the mare cannot be bred for two successive breeding seasons but remains in California during that period, her foal shall be considered to be a California-bred thoroughbred.

(c) A “California-bred quarter horse” is a quarter horse foal conceived in California by a stallion standing in California at the time of conception.

(d) A “California-bred standardbred horse” is a standardbred foal conceived by a stallion registered with the California Standardbred Sires Stakes Program.

(e) A “California-bred Appaloosa horse” is a horse dropped by a mare in California after being conceived in California, or any Appaloosa horse dropped by a mare in California if the mare remains in California to be next bred to an Appaloosa stallion standing in California. If the mare cannot be bred for two successive breeding seasons but remains in California during that period, her foal shall be considered to be a California-bred Appaloosa horse.

(f) A “California-bred paint horse” is a registered paint horse foal conceived in California by a stallion standing in California at the time of the conception, or by a registered paint horse stallion.

(g) A “California-sired horse” is a thoroughbred that was conceived in California by a registered California stallion. A California-sired horse is only eligible for entry in races restricted to California-bred or California-sired horses and is not eligible for any breeder or owner awards.