Objection

Claim of foul lodged by a jockey for perceived dangerous or illegal riding by a rival.

Apprentice

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

Main Track Only

A horse entered for main track only (MTO) is one hoping the weather forecast or track conditions will move the race off the turf course and onto the main track. They are scratched the morning of the race if the conditions stay dry.