Table 7. Effects of dietary energy and lysine levels on milk composition 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
	%	%	%	%	%	%	%	%
Casein (%)
Colostrum	5.25	4.52	7.06	6.08	7.34	7.70	9.38	6.53	1.929	0.03	0.31	0.74
Milk (21 d)	4.57	4.51	4.65	4.41	4.54	4.36	4.71	4.51	0.251	0.95	0.48	0.89
Fat (%)
Colostrum	9.45	7.89	7.56	8.11	7.87	10.19	6.21	7.07	1.371	0.54	0.12	0.17
Milk (21 d)	6.13	6.93	7.80	6.66	7.87	6.33	8.3.1	6.82	0.930	0.35	0.16	0.38
Protein (%)
Colostrum	6.50	5.61	9.18	7.76	9.57	9.98	12.40	8.45	2.644	0.03	0.29	0.74
Milk (21 d)	5.04	4.91	5.02	4.76	4.83	4.82	5.37	5.05	0.308	0.61	0.50	0.56
Lactose (%)
Colostrum	4.48	4.83	4.10	4.32	4.04	4.09	3.57	4.21	0.374	0.02	0.13	0.67
Milk (21 d)	5.95	6.04	6.03	6.08	5.78	5.83	5.28	5.95	0.220	0.04	0.34	0.39
Total solid (%)
Colostrum	22.44	20.06	23.54	22.54	24.49	27.44	25.70	22.13	2.671	0.03	0.62	0.18
Milk (21 d)	18.60	19.10	20.17	18.67	19.95	18.28	20.61	19.13	1.108	0.51	0.16	0.58
Solid not fat (%)
Colostrum	11.17	10.58	13.54	12.35	14.00	14.16	16.51	12.91	2.398	0.03	0.31	0.78
Milk (21 d)	11.37	11.17	11.19	11.03	10.93	10.96	10.95	11.08	0.306	0.23	0.97	0.78
Free fatty acid (%)
Colostrum	3.44	3.35	4.17	3.40	4.23	3.53	4.35	4.62	0.319	< .01	0.01	0.06
Milk (21 d)	5.54	5.49	4.65	6.16	6.37	5.25	5.43	4.85	0.848	0.96	0.44	0.21

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.
ME, metabolizable energy; Lys, lysine; SEM, standard error of the mean; E, energy effect; L, lysine effect; I, interaction between energy and lysine effect.