Fig. 4. Dry mass of subcutaneous, epididymal, perirenal, retroperitoneal and mesenteric fat depots as a function of body mass for male field voles exposed to short day photoperiod (SD, 8 h:16 h L:D, N=38) and long day photoperiod (LD, 16 h:8 h L:D) for 1–28 days (the increase phase, N=20) or 29–70 days (the plateau phase, N=25). After adjusting for the differences in body mass, the differences in dry fat mass between the three groups of voles were not significant (for statistical details, see Results).