Table 14.

The effect of dietary SID-Lys:ME ratio on plasma metabolic hormones of mixed parity sows (Exp. 2)

Item	SID-Lys:ME ratio, g/Mcal						P-value
	2.1	2.4	2.7	3.0	3.3	SEM	Treat	Linear	Quadratic
Insulin, μIU/mL	18.55	18.42	18.68	19.49	18.93	0.47	0.55	0.23	0.86
Insulin-like growth factor-1, ng/mL	185.4b	185.0b	192.5ab	200.4a	198.4a	4.32	0.02	< 0.01	0.86
Estradiol, pg/mL	23.69b	24.44b	27.91a	28.18a	28.29a	1.17	< 0.01	< 0.01	0.25
Luteinizing hormone, mIU/mL	6.11b	6.13b	6.46ab	7.52a	7.42a	0.41	0.02	< 0.01	0.74
Follicle-stimulating hormone, mIU/mL	10.69	10.61	11.29	11.21	11.23	0.51	0.81	0.30	0.78

^{a, b}Within a row, values with no common superscript differ significantly (P < 0.05)