Hi,
It's very important to send photocopy of original birth certificate with your PR application. If you don't have one and by any chance you send a Birth certificate issued by your country's consulate/mission, it will NOT be Accepted by CIC under any circumstances. Although that certificate if previously accepted by the provincial government for your PNP application will be rejected by CIC for PR application. This happened with one of my friends. CIC returned his application after 2 months and he had to file again fresh with a notarized Birth certificate issued from home country on a stamp paper signed by his parents that he is the only son born to them on that day. There's another option where one can go to the local municipality where one was born and get the birth certificate reissued. If the municipality doesn't find your birth record they can issue No Birth certificate signed and stamped and maybe notarized. You can check the proper procedure with CIC or on their website to get more clarity on it.
-Radium