When two or more horses owned wholly or in part by the same owner(s) or the spouse of any such owner, or trained by the same trainer run in a race, and are coupled at the discretion of the presiding judge in order to protect the public interest, they are called an "entry" and a wager on one horse in an entry shall be a wager on all of the horses in the entry.
N.J. Admin. Code § 13:71-27.16