(a) If less than six interests qualify horses to start in a race, the manager of the pari-mutuel department, with the consent of the representative of the commission, shall be permitted to prohibit show wagering on that race.

(b) If less than five interests qualify horses to start in a race, the said manager, with the consent of the representative of the commission, shall be permitted to prohibit both place and show wagering on that race.

(c) If less than three interests qualify horses to start in a race, the said manager, with the consent of the representative of the commission, shall be permitted to prohibit wagering on the race.

(d) The said manager, with the consent of the representative of the commission, may prohibit wagering on any particular horse or entry in any race. Such consent shall be sought by the manager of the pari-mutuel department from the representative of the commission after the entries are closed on the day previous to that on which the heat or races in which exclusions are desired are to be conducted. Such exclusions if consented to by the representative of the commission shall be clearly indicated on the program or score card and horses excluded shall be numbered so as to in no way infer that they are coupled in “the field.” Horses once excluded from the betting shall remain excluded during the day or race in which they are scheduled to start.