Dear Vijay,
There are various practices followed by various establishments. As you rightly understood, there is no hard & fast rule to govern specifically employees on "probation". Generally believed an employee on 'Probation' (or on training) is not expected to avail any regular leave excepting on emergencies. Many establishments have their Leave policy common to all including those on probation. It's reasonable. Whereas, on the contrary some establishments stipulates that, a probationer can avail all types of leave but the probation gets extended by those no. of days one avails leave during their probation period. Both have their own merits. However I don't think 'Trainees' have such an impediment. Training period is not a 'probation' both are not synonymous to each other.
However, many acts provide for crediting of leave commensurate with "no.of days worked" , say one day for every 20 days worked such as Factories Act, Karnataka Shops & Comml.Estt.Act. and so on. So a plain reading says when a person is considered as an 'employee' he is naturally entitled for leave as any other employee enjoys including a person on "Probation". In my opinion the Law does not distinguish between a person on 'probation' and the other person. I don't think there is a service condition which does not prescribe certain months of probation on the initial appointment with this employer. So every employee starts his/her career only as an 'Employee' who is on a 'probation' for months or years as per their rules. Hence unless and otherwise provided in the service conditions to the contrary this 'probationer' is also entitled to leave in accordance with general leave policy of the (your) establisment/hospital. However as you said your leave policy is silent about this aspect, it's suggested that you should ascertain from your HR about it to have a clear idea, may be they will be able to tell you from how they decided in the past about such matters which shall be binding on you.
You can have further reading on this subject from these links.-
http://karnataka.gov.in <link outdate - home link added> (Read section 15 sub sec.(1) & (3)) /Karnataka%20shops%20and%20commercial%20establishme nt%20act.pdf
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