Fig. 1

Development of spermatogenic cells and seminiferous cords/tubules in porcine testes. A HE staining of porcine testis sections at each age. The arrow points to spermatozoa, and the asterisk refers to seminiferous tubule lumen. Bar = 50 μm. B The diameter of seminiferous cords/tubules in porcine testes at each age. Data are presented as the mean ± SEM of three littermates, with 50 randomly selected round cord/tubule cross-sections analyzed per individual. Different letters indicate significant differences between groups (P < 0.05)