“…Further, similar result to earlier report has been demonstrated elsewhere (Schellander et al, 1990). There are different sources for supplemented sera such as FBS (Kobayeshi et al, 1994;Nandi, 1998;Mahmoud and Nawito, 2005;Das et al, 2006;Talukder et al, 2008), OCS (Schellander et al, 1990;Singha et al, 2015), steer serum (Roy et al, 1968;Nandi et al, 2001) and superovulated cow serum (Boediono et al, 1994). Although, there are reports to use different sera sources for supplementation in maturation medium, comparison was made within FBS, OCS and BSA only in the present study.…”