Table 9. Effects of vitamin supplementation levels in gestation diets on blood profiles of piglets in the lactation period

	Treatment¹⁾				SEM	p-value
	V1	V3	V6	V9	SEM	Lin.	Quad.
25-(OH) vitamin D (ng/mL)
24 hours postpartum	40.3^b	30.1^b	31.8^b	141.5^a	11.35	0.063	0.062
21 days of lactation	18.1^b	15.5^b	16.4^b	30.2^a	2.02	0.011	0.022
Vitamin E (Tocopherol) (μgmol/L)
24 hours postpartum	4.5^B	12.4^A	12.8^A	12.4^A	1.11	0.009	0.017
21 days of lactation	12.8	10.8	9.6	11.4	0.72	0.499	0.188
Calcium (mg/dL)
24 hours postpartum	10.6	10.1	9.7	10.0	0.16	0.238	0.190
21 days of lactation	11.0	11.4	10.9	11.0	0.12	0.519	0.876
Phosphorus (mg/dL)
24 hours postpartum	5.7	8.0	5.4	6.5	0.40	0.838	0.674
21 days of lactation	9.6	9.6	9.5	9.5	0.24	0.817	0.967

Treatment: V1, corn-soybean meal (SBM)-based diet with 1× National Research Council (NRC, 2012) vitamin requirement; V3, corn-SBM-based diet with 3× NRC (2012) vitamin requirement; V6, corn-SBM-based diet with 6× NRC (2012) vitamin requirement; V9, corn-SBM-based diet with 9× NRC (2012) vitamin requirement.
Means with different capital letter superscripts in the same row are significantly different (p < 0.01).
Means with different small letter superscripts in the same row are significantly different (p < 0.05).
Lin., linear; Quad., quadratic.