Percentage change in body mass, reproductive tissue mass, and epididymal and parametrial white adipose tissue (EWAT/PWAT) mass following 9 weeks of photoperiodic treatment. Percentage change in (A,D) body mass; (B,E) reproductive tissue mass; and (C,F) EWAT/PWAT mass in male (A–C) and female (D–F) long-day (LD) hamsters, and short-day responsive (SD-R) and non-responsive (SD-NR) hamsters. Bars represent means±s.e.m. (LD: N=9, SD-R: N=9, SD-NR: N=8, for both males and females). An asterisk indicates a statistically significant difference between group means (P<0.001; male and female percentage change in body mass, male paired testes mass and EWAT mass: one-way ANOVA; female uterine horns mass and PWAT mass: Welch's ANOVA).