Table 7.

Apparent total tract digestibility of minerals in diets containing different concentrations of phytate and phytase dose¹,²

	Apparent total tract digestibility, %
Item	Ca	P	Na	Mg	K
0.23% phytate-bound P3
0 PhyG, FTU/kg	61.2	21.2f	74.0	21.0defg	76.9
500 PhyG, FTU/kg	78.5	56.4d	81.5	22.6def	81.3
1,000 PhyG, FTU/kg	82.3	67.9bc	87.5	29.6abc	82.0
2,000 PhyG, FTU/kg	83.8	68.9bc	89.6	30.7ab	82.6
4,000 PhyG, FTU/kg	83.3	74.7a	91.6	32.2a	82.7
0.29% phytate-bound P4
0 PhyG, FTU/kg	56.2	23.4f	76.2	17.7fgh	73.9
500 PhyG, FTU/kg	74.3	51.2e	76.2	24.8bcd	74.5
1,000 PhyG, FTU/kg	74.5	59.6d	85.3	21.1defg	74.6
2,000 PhyG, FTU/kg	80.5	72.1ab	89.5	25.1bcd	80.1
4,000 PhyG, FTU/kg	79.4	74.4a	92.6	24.0cde	82.6
0.35% phytate-bound P5
0 PhyG, FTU/kg	54.6	24.1f	68.9	16.2gh	69.6
500 PhyG, FTU/kg	69.7	48.6e	76.8	18.5efgh	67.3
1,000 PhyG, FTU/kg	73.7	60.1d	83.3	21.5defg	71.5
2,000 PhyG, FTU/kg	71.6	66.9c	92.1	16.5gh	76.9
4,000 PhyG, FTU/kg	73.8	66.9bc	91.1	14.8h	71.0
SEM	2.67	2.50	2.83	3.52	2.00
P-value
Phytate-bound P	<0.001	<0.001	0.242	<0.001	<0.001
PhyG	<0.001	<0.001	<0.001	0.004	<0.001
Phytate-bound P × PhyG	0.735	0.002	0.419	0.014	0.062

¹FTU, phytase units.

²Data are least squares means of eight observations per treatment, except for 0.23% phytate-bound P with 4,000 FTU/kg PhyG diet, 0.35% phytate-bound P with 1,000 FTU/kg PhyG diet, 0.23% phytate-bound P with 1,000 FTU/kg PhyB diet, 0.29% phytate-bound P with 1,000 FTU/kg PhyB diet, and 0.35% phytate-bound P with 4,000 FTU/kg PhyG diet which represent seven observations per treatment.

³Linear and quadratic increase for ATTD of Ca, P, Na, Mg: P < 0.05; Linear increase for ATTD of K: P < 0.05.

⁴Linear and quadratic increase for ATTD of Ca, P, and Na: P < 0.05; Linear increase for ATTD of K: P < 0.05.

⁵Linear and quadratic increase for ATTD of Ca, P, and Na: P < 0.05; Quadratic increase for ATTD of K: P < 0.05.

^a–hMeans within a column lacking a common letter are different (P ≤ 0.05).