Table 7. Effects of vitamin supplementation levels in gestation diets on serum calcium and phosphorus level during the gestation period

	Treatment¹⁾				SEM	p-value
	V1	V3	V6	V9	SEM	Lin.	Quad.
Calcium (mg/dL)
Initial	9.72
14 days	9.9	9.6	10.0	10.0	0.09	0.349	0.348
28 days	9.8	9.9	10.0	10.0	0.08	0.451	0.671
70 days	9.8^ab	10.0^a	9.8^ab	9.5^b	0.06	0.067	0.019
90 days	9.3	9.4	9.1	9.6	0.09	0.479	0.240
110 days	9.4	9.6	9.4	10.1	0.11	0.077	0.391
Inorganic phosphorus (mg/dL)
Initial	6.30
14 days	6.0	6.1	5.8	6.2	0.14	0.914	0.629
28 days	6.2	6.5	6.3	6.9	0.14	0.112	0.612
70 days	5.9	5.9	6.1	5.7	0.10	0.756	0.330
90 days	5.6	5.7	5.9	5.6	0.17	0.985	0.589
110 days	7.3	6.6	6.7	7.7	0.18	0.269	0.020

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 small letter superscripts in the same row are significantly different (p < 0.05).
Lin., linear; Quad., quadratic.