Serum lipid indices of all F1 JXH chickens in the control (C, n = 105), maternal (M, n = 80) and paternal (P, n = 82) groups. TG: triglyceride, CHOL: total cholesterol, LDL-CHOL: low-density lipoprotein, HDL-CHOL: high-density lipoprotein. * indicates p < 0.05 and ** indicates p < 0.01.