Effects of reciprocal crossings between giant (TG) and other families including Koutsuki (KT1 and KT2) and Neo (NE1 and NE 2) on the body weight of offspring at hatchling in F2. Different letters in each crossing experiment indicate statistically significant differences at the 5% level using the Tukey’s multiple comparison test; ns indicates no significant difference by ANOVA. Nymphs and adults of F1 were reared as groups at LD 12:12h, and their eggs (F2) were allowed to hatch at 30°C after diapause termination. Numbers in parentheses indicate sample sizes, with a mean of 13.8 hatchlings in each sample.