Table 4. Effects of feeding type and dietary energy level on blood metabolites of lactating sows during summer season

Item1)	Feeding type		Energy level (ME, kcal/kg)		SEM	p-value
	CF	FF	3,300	3,400		F	E	F × E
Post farrowing (mg/dL)
Blood urea nitrogen	19.52	19.74	19.40	19.86	0.91	0.810	0.622	0.746
Glucose	93.57	90.12	91.96	91.72	4.12	0.408	0.954	0.602
Triglyceride	42.21	42.58	42.09	42.70	2.88	0.898	0.832	0.562
Creatinine	2.15	2.12	2.15	2.12	0.10	0.745	0.812	0.289
Weanling (mg/dL)
Blood urea nitrogen	20.98	20.49	20.96	20.51	0.95	0.610	0.643	0.446
Glucose	92.57	97.13	94.03	95.67	5.78	0.443	0.782	0.941
Triglyceride	24.67	26.84	25.18	26.33	1.41	0.130	0.419	0.891
Creatinine	1.69	1.62	1.65	1.66	0.10	0.458	0.882	0.703

Data are means of seven replicates.
SEM, standard error of means; CF, conventional feeding; FF, free feeding; F, feeding type, E, dietary energy level, F × E, feeding type × dietary energy level.