Table 5.

Effect of high doses of Natuphos E 5,000 G on nursery pig growth performance and bone ash values^a

Item	Negative Controlb						Positive Controlc		SEM	P <
										Negative Control		NC vs. PC	NC + 500 vs. PCd	PC vs. PC + 2,000
	0	500	1,000	2,000	3,000	4,000	0	2,000		Linear	Quadratic
BW, kg
d 0	5.9	5.9	5.9	5.9	5.9	5.9	5.9	5.9	0.01	0.250	0.818	0.687	0.230	0.421
d 42	21.5	21.4	22.6	22.2	22.5	22.2	22.7	22.6	0.38	0.082	0.128	0.035	0.021	0.921
d 0 to 7
ADG, g	64	74	84	72	77	83	83	75	9.6	0.293	0.785	0.145	0.475	0.512
ADFI, g	112	114	124	108	118	129	123	115	6.9	0.165	0.347	0.248	0.332	0.403
G:F, g/kg	562	645	675	666	636	640	665	616	57.1	0.558	0.228	0.157	0.785	0.499
d 7 to 21
ADG, g	276	271	297	277	295	291	295	285	14.9	0.274	0.763	0.333	0.215	0.630
ADFI, g	349	345	363	352	361	362	369	349	13.9	0.343	0.851	0.250	0.173	0.241
G:F, g/kg	791	782	816	786	814	802	795	818	18.1	0.456	0.774	0.866	0.595	0.352
d 21 to 42
ADG, g	541	541	569	569	568	557	577	581	13.5	0.192	0.078	0.038	0.048	0.847
ADFI, g	820	790	844	837	838	847	871	849	19.6	0.095	0.644	0.049	0.003	0.398
G:F, g/kg	659	685	674	680	678	658	663	685	7.8	0.493	0.001	0.696	0.047	0.047
d 0 to 42
ADG, g	369	377	396	387	395	381	400	398	10.2	0.314	0.064	0.027	0.107	0.864
ADFI, g	540	529	562	551	559	555	580	561	13.5	0.188	0.427	0.029	0.007	0.289
G:F, g/kg	684	713	705	702	707	686	689	709	7.8	0.616	0.008	0.571	0.032	0.060
Bone ash, ge	1.94	2.30	2.35	2.56	2.53	2.25	2.42	2.51	0.093	0.012	0.001	0.001	0.374	0.465
Bone ash, %	44.2	45.2	47.1	48.0	48.4	49.1	47.0	51.3	0.007	0.001	0.078	0.010	0.099	0.001

^aA total of 360 barrows (DNA 200 × 400, initially 5.9 ± 0.1 kg) were used in a 42 d growth study with five pigs per pen and nine pens per treatment (Natuphos E 5,000 G, BASF Corporation, Florham Park, NJ).

^bNegative control diets were formulated with 0.40, 0.30, or 0.25% aP from inorganic P for Phases 1, 2, and 3, respectively. Phytase was added at 0, 500, 1,000, 2,000, 3,000, 4,000 FTU/kg to the negative control diet to achieve final experimental diets.

^cPositive control diets were formulated with 0.55, 0.45, or 0.40% aP from inorganic P for Phases 1, 2, and 3, respectively. Phytase was added at either 0 or 2,000 FTU/kg to the positive control diet to achieve final experimental diets.

^dNC diets were formulated to be the PC minus 0.15% P and 0.14% Ca released by 500 FTU/kg Natuphos E suggested by the manufacturer. The NC + 500 FTU and PC treatments were compared to confirm the estimated release value.

^eOne pig per pen was euthanized and fibulas were used to determine bone ash weight and percentage bone ash.