Figure 1.

Least square means ± standard error of (a) the body weight of the mixed-sex chickens (birth weight (0), 2, 4, and 6 weeks of age), (b) body weight of the males (birth weight (0), 2, 4, and 6 weeks of age), (c) body weight of the females (birth weight (0), 2, 4, and 6 weeks of age), and (d) breast circumference at 6 weeks of age of the mixed-sex, male, and female chickens. KKU1 = crossbred chicken between commercial broiler and Thai indigenous synthetic chickens (Kaimook e-san1); KKU2 = crossbred chicken between Kaimook e-san2 and Kaimook e-san1 (both of which are Thai indigenous synthetic chickens). Means for the same trait with different letters (^a,b) differ significantly (p < 0.05).