Table 6.

Least squares means for concentration of Ca and P in plasma of pigs fed diets containing different concentrations of standardized total tract digestible (STTD) Ca and STTD P for 21 d^a

Item	STTD Ca, %
	0.14	0.29	0.44	0.59	0.74
Plasma Ca, mg/dLb
0.16% STTD P	11.13	12.07	13.78	13.65	15.42
0.33% STTD P	9.37	11.68	12.35	12.96	13.47
0.42% STTD P	8.07	11.33	11.67	12.50	13.20
0.50% STTD P	9.40	11.03	12.07	11.78	12.14
Plasma P, mg/dLc
0.16% STTD P	8.17	8.36	8.85	9.08	9.75
0.33% STTD P	12.78	14.67	14.26	12.18	12.48
0.42% STTD P	13.73	14.16	15.28	15.21	14.11
0.50% STTD P	13.51	14.66	15.05	14.59	16.29

^aData are least squares means of 7 or 8 observations

^bStandard error of the within treatment least squares means = 0.42

^cStandard error of the within treatment least squares means = 0.59