What happens if a horse is gelded?

When a horse is gelded, it undergoes a surgical procedure that removes the testicles, effectively altering its reproductive status. It is essential to report this change to The Jockey Club because they maintain records of equine identity and status. This information is crucial for maintaining accurate breeding records and racing eligibility, as well as ensuring the integrity of the sport. By informing The Jockey Club about the gelding, the trainer helps keep important databases updated, which can impact the horse's racing history and eligibility. This step is vital for regulatory compliance and for the proper administration of racing events.

The correct answer highlights the importance of proper documentation and communication within the racing community, ensuring that all parties have access to accurate, up-to-date information about participating horses.