Fig. 2

Heterosis of carcass performance for purebred and crossbred progenies at 6 weeks of age. The breast muscle weight, drumstick bone weight, drumstick weight (bone and muscle) and wing weight were measured on both sides. The drumstick muscle weight was calculated as the drumstick weight subtracted from the drumstick bone weight. a-b Female. c-d Male. For (a) and (c), the dashed red line represents the mid-parent value. For (b) and (d), ns, * and ** indicate that the heterosis as a percentage (H%) was not statistically significant (P > 0.05), significant (P < 0.05) and highly significant (P < 0.01), respectively