There is no exclusive leave rule applicable for probationers. Leave rules are governed by what is stated in your appointment letter and other terms & conditions applicable to the appointment/post. Traditionally, no regular leave like EL/PL, sick leave, etc., is applicable as they "should be earned" by rendering a year of service. Some employers allow leave proportionately for the fraction of a year of service rendered; rarely, some even credit leave days in advance in deserving cases in emergencies like serious sickness, accident hospitalization, etc. It all depends on the convention & precedence followed in an establishment.
Casual leave, if applicable, can be allowed proportionately or in full measure. However, conventionally it cannot be claimed as a right during probation. The practice is, if and when allowed, there is a catch: your probation period is likely to be extended by so many days of leave you are availing/allowed. In some establishments, they allow the probationer to accumulate the compensatory off days granted for OT work done, if any, to be utilized as unofficial leave (alternate off days) in order to help the go-getters.
Regards