Stage-specific expression of DDX4 and c-kit at different developmental stages of the porcine testis.

•DDX4 and C-kit were detected in pocine undifferentiated spermatogonia at prepubertal stages.•DDX4 and C-kit were detected in porcine spermatocyte at postpubertal stages.•DDX4 expressed spermatocyte was not detected SCP3 and acrosin.•DDX4 detected in in-vitro cultured porcine undifferentiated spermatogonia.