Table 4.

Effect of digestible P (g/kg) and Ca:digestible P on blood serum and urinary concentrations in grower pigs on d 42 and in finisher pigs on d 91.

Item	Digestible P1			Ca:Digestible P
	P–	P+	p-Value 2	2.2:1	2.5:1	2.8:1	p-Value 2	SEM
N°	36	48		24	36	24
Urine at slaughter 3
pH	7.53	7.56	n.s.	7.55	7.51	7.58	n.s.	0.084
Creatinine (mmol/L)	7.27	8.05	n.s.	7.78	7.22	7.98	n.s.	1.141
Ca (mol/mol creatinine)	0.07	0.09	n.s.	0.08	0.09	0.08	n.s.	0.021
P (mol/mol creatinine)	1.09	1.24	n.s.	1.42a	1.00b	1.07b	**	0.146
Blood serum
Ca (mmol/L) on day 42	2.88	2.85	n.s.	2.85	2.86	2.89	n.s.	0.030
P (mmol/L) on day 42	2.53	2.49	n.s.	2.53	2.52	2.46	n.s.	0.043
Ca (mmol/L) at slaughter	2.92	2.88	n.s.	2.87	2.94	2.89	n.s.	0.043
P (mmol/L) at slaughter	3.10	3.08	n.s.	3.13	3.03	3.12	n.s.	0.075

¹ P– = Formulated to contain 2.5 and 1.7 g digestible P/kg grower and finisher diets, respectively. P+ = Formulated to contain 3.0 and 2.4 g digestible P/kg grower and finisher diets, respectively. ² ** p < 0.01; * p < 0.05; n.s. (non-significant) p > 0.05; two-way interactions were not significant. Thus only main effects are presented. For each main factor, values in the same row not followed by the same letter differ. ³ Data from 49 samples in total (7 per treatment, except 14 in P+2.5:1)