Table 6. Effects of dietary energy and lysine levels on blood profiles in primiparous sows

Item1)	ME 3,265 kcal/kg				ME 3,365 kcal/kg				SEM	p-value
	Lys	Lys	Lys	Lys	Lys	Lys	Lys	Lys		E	L	I
	0.55	0.65	0.75	0.85	0.55	0.65	0.75	0.85
	0.70	0.85	1.00	1.15	0.70	0.85	1.00	1.15
	%	%	%	%	%	%	%	%
Total protein (g/dL)
35 d	--------------------------7.5--------------------------
110 d	7.16	7.15	7.36	6.90	6.46	7.03	7.26	7.16	0.356	0.33	0.23	0.25
24 hrs postpartum	6.25	6.30	6.80	6.56	6.66	6.00	6.63	6.50	0.445	0.88	0.25	0.59
Day 21 of lactation	6.30	6.55	6.30	6.10	6.30	6.70	6.43	6.46	0.384	0.39	0.54	0.91
Creatinine (mg/dL)
35 d	--------------------------1.90--------------------------
110 d	1.89	2.37	2.22	2.05	1.99	1.96	2.16	2.19	0.195	0.56	0.26	0.18
24 hrs postpartum	1.49	2.59	2.58	2.03	2.10	2.19	2.21	2.29	0.319	0.87	0.04	0.09
Day 21 of lactation	1.57	1.64	1.68	1.60	1.89	2.00	1.60	1.45	0.272	0.38	0.42	0.38
Blood urea nitrogen (mg/dL)
35 d	--------------------------12.0--------------------------
110 d2)	6.5	6.70	8.1	7.2	6.8	7.9	8.3	8.5	0.71	0.08	0.09	0.71
24 hrs postpartum	11.9	10.1	8.0	10.5	9.4	10.5	9.4	10.7	1.59	0.86	0.33	0.42
Day 21 of lactation3)	15.7	14.4	12.3	13.1	15.7	18.1	14.4	12.4	1.88	0.15	0.02	0.27

Factors: energy level (3,265 or 3,365 kcal of ME/kg) and lysine level (total lysine 0.55/0.70%, 0.65/0.85%, 0.75/1.00%, 0.85/1.15%) in gestation/lactation diet.
Linear response (p < 0.05) to dietary lysine levels when significance of lysine effect was detected.
Linear response (p < 0.01) to dietary lysine levels when significance of lysine effect was detected.
ME, metabolizable energy; Lys, lysine; SEM, standard error of the mean; E, energy effect; L, lysine effect; I, interaction between energy and lysine effect.