In making an entry for a produce race, the produce is entered by specifying the dam and the sire or sires. The entry of the mare is void if: The produce of a mare is dropped before the 1st of January; There is no produce; The produce is dead when dropped; or Twins are dropped. In produce races, allowances for the produce of untried horses shall be claimed before the time of closing, and are not lost by subsequent winnings.