Present study investigated the effects of gender on the quality of M. gastrocnemius, pars externa for ostrich during 1 to 14-d storage. Data showed that the mean value of pH during aging was higher (p<0.001) in male ostriches (6.40) than female (6.27). Female ostriches had significantly (p<0.001) more pH-decline rate at the first 24hr. Results indicated Myofibril Fragmentation Index (MFI) increased (p<0.001) with aging so that the enhancement was from 9.97 (1-d) to 10.75 (7-d). The mean values of SL (Sarcomere Length) were proliferated (p<0.001) at 3hr (3.68μm) to 5-d (5.46 μm) ageing. Shear force (SF) decreased from 27.14N (1-d) to 20.28N (5-d) which was supported by increasing the SL and MFI at this days. According to the ANOVA data, there were no significant differences (p>0.05) between male and female ostriches due to the MFI, SL and SF.

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