Table 10.

Effects of PhyG and PhyB on growth performance, apparent total tract digestibility of minerals, and bone parameters of growing pigs¹

	0.23% phytate-P		0.29% phytate-P		0.35% phytate-P			P-value
Item	PhyG	PhyB	PhyG	PhyB	PhyG	PhyB	SEM	0.23% phytate-P	0.29% phytate-P	0.35% phytate-P	Overall2
Growth performance, day 1 to 20
Initial body weight, kg	12.21	12.19	12.66	12.37	13.16	13.17	1.43	0.977	0.505	0.982	0.698
ADG, kg	0.571	0.510	0.606	0.579	0.624	0.594	0.04	0.098	0.450	0.404	0.062
ADFI, kg	1.003	0.921	1.023	0.990	1.081	1.044	0.06	0.121	0.532	0.483	0.097
G:F	0.569	0.552	0.596	0.586	0.576	0.569	0.02	0.531	0.723	0.796	0.475
Final body weight, kg	23.62	22.40	24.78	23.94	25.64	25.04	2.02	0.195	0.371	0.525	0.104
ATTD of minerals, %
Ca	82.3	80.2	74.5	76.4	73.7	67.4	2.64	0.485	0.532	0.038	0.213
P	67.9	64.5	59.6	58.8	60.1	50.1	2.51	0.159	0.739	<0.001	0.001
Na	87.5	83.6	85.3	86.5	83.3	80.5	3.02	0.232	0.710	0.387	0.332
Mg	29.6	32.1	21.1	19.4	21.5	16.8	3.54	0.447	0.579	0.113	0.466
K	82.0	82.7	74.6	76.4	71.5	69.4	2.01	0.784	0.466	0.410	0.942
Bone parameters
Bone ash, g per femur	11.26	11.22	12.53	11.78	14.76	13.51	1.02	0.951	0.280	0.096	0.102
Bone Ca, g per femur	4.37	4.36	5.20	4.48	5.73	5.09	0.32	0.991	0.007	0.012	0.003
Bone P, g per femur	2.09	2.09	2.56	2.17	2.73	2.45	0.15	0.981	0.002	0.031	0.002
Bone ash, %	53.18	51.74	52.81	51.79	54.03	53.46	0.59	0.019	0.117	0.346	0.006
Bone Ca, %	38.74	38.97	38.91	38.22	38.90	37.99	0.76	0.667	0.196	0.088	0.138
Bone P, %	18.61	18.66	19.15	18.50	18.79	18.58	0.35	0.846	0.009	0.379	0.055
Ca:P in bone	2.08	2.09	2.03	2.06	2.07	2.05	0.01	0.637	0.074	0.138	0.603

¹Data are least squares means of eight observations per treatment; both phytases were included at 1,000 phytase units/kg.

²Overall: P-value for a contrast analysis conducted between PhyG and PhyB regardless of the level of phytate in the diet.