Table 7.

Effect of dietary vitamin K (VK) supplementation and Salmonella Enteritidis (SE) challenge on serum biochemical indices of laying hens (n = 6)

VK, mg/kg	SEc	Cad, mmol/L		CTe, pg/mL		PTHf, pg/mL		cOCg, ng/mL		ucOCh, ng/mL		cOC/(cOC + ucOC), %
		Week 42	Week 44	Week 42	Week 44	Week 42	Week 44	Week 42	Week 44	Week 42	Week 44	Week 42	Week 44
0	–	5.83	3.47b	321.53	231.04	102.19	98.26	2.38	2.07	2.10	2.43	57.92	44.33
0	+		5.40a		330.98		99.39		1.87		2.46		43.90
2	–	5.03	4.66ab	270.89	262.15	67.43	92.20	2.32	2.45	1.54	1.45	59.75	63.70
2	+		4.57ab		301.62		81.93		2.76		1.39		67.64
	SEMi	0.973	0.406	29.193	25.980	15.255	8.219	0.301	0.100	0.400	0.285	0.731	2.539
0		–	4.37	–	246.60b	–	98.64	–	1.99b	–	2.44a	–	44.16b
2		–	4.62	–	314.20a	–	88.78	–	2.52a	–	1.43b	–	64.69a
	SEMi	–	0.287	–	17.770	–	5.897	–	0.073	–	0.179	–	2.273
	–	–	4.06b	–	281.01	–	95.23	–	2.67	–	2.01	–	54.02
	+	–	4.98a	–	284.71	–	90.66	–	2.76	–	1.92	–	51.81
	SEMi	–	0.287	–	17.770	–	5.811	–	0.071	–	0.178	–	2.244
	VK	0.622	0.661	0.345	0.022	0.248	0.20	0.898	< 0.001	0.424	0.005	0.220	0.001
P-values8	SE	–	0.032	–	0.973	–	0.60	–	0.662	–	0.959	–	0.611
	VK × SE	–	0.019	–	0.260	–	0.513	–	0.051	–	0.861	–	0.530

^{a, b}Means within a column with no common superscripts differ (P < 0.05)

^cSE Salmonella Enteritidis; −, without SE challenge; +, with SE challenge

^dCa Calcium

^eCT calcitonin

^fPTH Parathyroid hormone

^gcOC Carboxylated osteocalcin

^hucOC Undercarboxylated osteocalcin

ⁱSEM Pooled standard error of the mean

⁸P-values for main effect of VK, the main effect of SE challenge, and the interaction between the VK treatments and SE challenge