Today's AU - Port Augusta Horse Racing Picks

Apprentice

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

Minus Pool

A pari-mutuel pool – typically a show pool - where one horse is so heavily bet that after deductions there is not enough money left to cover the prescribed minimum on each bet.

Scratch

A horse is a scratch when injury or other necessity causes it to be withdrawn from the race.