Table 3.

Pearson’s correlation between Ca, tP, and aP, daily Ca:tP ratio and daily Ca:aP ratio, and serum phosphorus, serum calcium, serum calcium to phosphorus ratio, FGF23, VitD, ALP, and OCN in gilts and barrows

		Gilts					Barrows
Item	Weeka	tP intake, g/d	aP intake, g/d	Ca intake, g/d	Daily Ca:tP ratio	Daily Ca:aP ratio	tP intake, g/d	aP intake, g/d	Ca intake, g/d	Daily Ca:tP ratio	Daily Ca:aP ratio
Serum P, mmol/L	1	0.24	0.58*	0.27	0.76*	−0.76*	0.16	0.55*	0.21	0.61*	−0.61*
	4	0.12	0.32	0.15	0.33	−0.33	0.31	0.42*	0.33	0.22	−0.22
	8	0.41*	0.2	0.39*	−0.25	0.25	0.39*	0.33	0.39*	−0.23	0.23
Serum Ca, mmol/L	1	0.09	−0.22	0.06	−0.58*	0.58*	0.31	−0.19	0.27	−0.61*	0.61*
	4	0.06	−0.09	0.05	−0.17	0.17	0.27	0.28	0.28	0.06	−0.06
	8	0.57*	0.50*	0.58*	0.01	−0.01	0.46*	0.33	0.45*	−0.26	0.26
Serum Ca:P ratio	1	−0.17	−0.57*	−0.21	−0.86*	0.86*	−0.01	−0.52*	−0.06	−0.74*	0.74*
	4	−0.12	−0.41*	−0.16	−0.46*	0.46*	−0.19	−0.35	−0.21	−0.27	0.27
	8	−0.05	0.1	−0.04	0.25	−0.25	−0.23	−0.21	−0.23	0.14	−0.14
Serum FGF23, pg/mL	1	0.11	−0.03	0.1	−0.22	0.22	−0.27	−0.2	−0.28	0.04	−0.04
	4	−0.23	−0.13	−0.22	0.02	−0.02	0.13	0.19	0.14	0.1	−0.1
	8	−0.14	0.01	−0.13	0.2	−0.2	−0.07	−0.07	−0.07	0.05	−0.05
Serum VitD, ng/mL	1	−0.12	−0.08	−0.12	0.07	−0.07	0.12	0.38*	0.15	0.33	−0.33
	4	0.12	0.05	0.12	−0.04	0.04	0.14	0.07	0.14	−0.06	0.06
	8	−0.48*	−0.50*	−0.49*	−0.11	0.11	−0.51*	−0.60*	−0.52*	−0.1	0.1
Serum ALP, U/L	1	−0.47*	−0.47*	−0.47*	−0.16	0.16	−0.12	−0.14	−0.12	−0.1	0.1
	4	−0.06	0.06	−0.05	0.16	−0.16	−0.02	0.15	−0.01	0.24	−0.24
	8	0.32	0.44*	0.34	0.21	−0.21	0.32	0.31	0.32	0	0
Serum OCN, ng/mL	1	0.60*	0.45*	0.59*	−0.11	0.11	0.50*	0.29	0.50*	−0.19	0.19
	4	0.11	0.25	0.13	0.24	−0.24	0.04	0.12	0.05	0.11	−0.11
	8	0.15	0.2	0.15	0.18	−0.18	0.15	0.27	0.16	0.2	−0.2

^a Week 1: correlation between Ca, tP, and aP intake from days 1 to 7 and serum parameters from days 2 + 3 (in week 1); week 4: correlation between Ca, tP, and aP intake from days 22 to 28 and serum parameters 23 + 24 (in week 4); week 8: correlation between Ca, tP, and aP intake from days 50 to 56 and serum parameters days 52 + 53 (in week 8).

*|r| > 0.35 and P < 0.05.