Table 5.

Characterization of plasma hormones in native chickens with high, medium, and low RFI

Items	RFI groups			SEM1	P-value
	High	Medium	Low
No. of birds	25	25	25
GH, ng/mL	11.04	11.13	11.72	0.16	0.164
IGF-1, ng/mL	62.14a	96.91b	114.48c	3.02	< 0.001
Leptin, ng/mL	11.54	11.58	10.97	0.23	0.476
T3, nmol/L	7.09a	5.76b	5.00c	1.21	< 0.001
T4, nmol/L	151.15	157.7	157.45	2.86	0.564
TRH, pg/mL	86.16	86.21	88.34	1.44	0.776
ACTH, pg/mL	74.85a	69.1ab	64.39b	1.29	0.002
Cortisol, ng/mL	138.43a	127.59b	108.41c	2.11	< 0.001

¹SEM, pooled standard error of mean.

^a–cMeans within a row with different superscripts letters were significantly different (P < 0.05).