Fig. 1.

Testosterone levels in dietary and gavage administration conditions in relation to fish oil. Immunohistological staining of anti-testosterone in the dietary administration group and the testosterone-positive area of sections of a testis (a). Scale bars=250 µm. Immunohistological staining of anti-testosterone in the gavage group and the testosterone-positive area of sections of a testis (b). Scale bars=250 µm. The serum testosterone level in the dietary administration group (c). The serum testosterone level in the gavage group (d). The data are presented as mean±SEM, n=5;*P<0.05 compared to the control group.