The minimum jockey mount fee for a losing mount in the race must be on deposit with the paymaster of purses, except for a jockey riding for his contract employer, prior to the time for weighing out, and failure to have such minimum fee on deposit is cause for disciplinary action and cause for the stewards to declare the horse for which such fee is to be deposited. The association assumes the obligation to advance the minimum jockey fee to the engaged jockey in the absence of a declaration of the horse from the race, and any such advanced fee is a lien upon the horse.