Table 4.

Least squares means for growth performance 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
Initial BW, kgb
0.16% STTD P	11.13	10.98	11.21	11.06	11.02
0.33% STTD P	10.89	10.98	11.01	11.17	11.09
0.42% STTD P	11.11	11.12	11.12	11.14	10.95
0.50% STTD P	11.15	11.09	11.05	11.19	11.08
Final BW, kgc
0.16% STTD P	20.87	20.91	20.77	19.36	18.11
0.33% STTD P	22.07	23.78	23.79	23.47	22.61
0.42% STTD P	20.69	24.50	23.67	24.00	23.47
0.50% STTD P	20.04	22.80	23.71	24.27	24.01
ADG, gd
0.16% STTD P	465	473	455	395	337
0.33% STTD P	530	609	621	586	548
0.42% STTD P	451	637	598	612	596
0.50% STTD P	413	557	599	622	615
ADFI, ge
0.16% STTD P	848	849	864	808	791
0.33% STTD P	871	948	931	933	914
0.42% STTD P	763	978	895	958	928
0.50% STTD P	752	869	925	940	936
G:F, g:gf
0.16% STTD P	0.549	0.556	0.527	0.488	0.425
0.33% STTD P	0.610	0.645	0.656	0.628	0.601
0.42% STTD P	0.592	0.654	0.671	0.640	0.643
0.50% STTD P	0.549	0.643	0.649	0.663	0.658

^aData are least squares means of 8 observations with the exception of diet 0.44% STTD Ca and 0.33% STTD P for ADG (n = 7)

^bStandard error of the within treatment least squares means = 0.51

^cStandard error of the within treatment least squares means = 0.80

^dStandard error of the within treatment least squares means = 0.02

^eStandard error of the within treatment least squares means = 0.04

^fStandard error of the within treatment least squares means = 0.01