Jockeys are generally not allowed to bet on horse races in which they are riding or on other races that could be considered a conflict of interest. The rules regarding jockeys and betting are stringent due to the potential for conflicts of interest and the integrity of the sport.
The specific regulations can vary by racing jurisdiction, but many racing authorities have explicit policies that prohibit jockeys from betting on races. For example, in the United States, the Jockey Club, which is the organization that sets the rules for thoroughbred racing, has a rule that prohibits jockeys from betting on races in which they are riding.
Violations of these rules can result in fines, suspensions, or even longer-term bans from racing. The intention behind these rules is to maintain the integrity of horse racing by ensuring that those involved in the races are not influenced by personal financial gain from betting activities.