Cal. Business and Professions Code § 19617.6

(a) Since the purpose of this chapter is to encourage agriculture and the breeding of horses in this state, a sum equal to 10 percent of the first money of each purse won by a registered California-bred horse at a harness racing meeting shall be paid by the licensee conducting the meeting to the owner of the horse. This section applies to any California-bred standardbred horse for all races except the California Standardbred Sires Stakes races, other stakes races designed for California-bred standardbred horses, and late closing events and series conducted at the harness racing meetings in California. (b) Each licensee conducting a harness race meeting shall pay the sums required to be paid in subdivision (a) out of the amount deducted for purses pursuant to subdivision (b) of Section 19612, Section 19612.6, and subdivision (d) of Section 19616.1. (c) Funds paid to owners of California-bred standardbred horses pursuant to this section shall be distributed by the licensed harness racing association no later than 30 calendar days after the conclusion of the racing meeting.