Today's SE - Umaker Horse Racing Picks

Pari-Mutuel

A pool style wagering system, where all money input through betting is divided among those with winning tickets (save for various deductions by the track operators).

Apprentice

A new jockey who has not ridden a certain number of winners in a specified time period.

Breeder

The owner of a horse’s dam – or mother - at the time a horse is foaled.