Effects of background colors, fasting, and SLa expression on hepatic triglycerides. Four pairs of three strains (ci, Actb-SLa:GFP, and HNI) were kept under four breeding conditions (control, white background, black background, or fasting). a and b, environmental effects on the HSI (a) and percent hepatic triglycerides (b). c and d, genetic effects on the HSI (c) and percent hepatic triglycerides (d). Letters in the bars indicate significant differences between the groups according to a two-way ANOVA and a Dunnett post hoc (a and b) or Tukey’s post hoc HSD (c and d) test.