Table 4.

Effect of graded levels of β-mannanase supplementation on apparent total tract digestibility (Exp. 1)¹

Digestibility (%)	β-mannanase (U/kg)				SEM2	p-value
	0	200	400	600		ANOVA	Linear	Quadratic
Day 13 and 14
Dry matter	78.80	78.81	82.62	81.72	0.71	<0.01	<0.01	0.01
Gross energy	79.52	77.62	82.78	81.36	0.72	<0.01	0.02	0.07
Crude protein	67.73	68.09	73.78	73.04	0.98	<0.01	<0.01	<0.01
Neutral detergent fiber	50.93	55.72	60.97	56.51	2.19	0.03	0.05	0.02
Acid detergent fiber	47.26	51.96	58.19	52.49	2.29	0.03	0.07	0.02
Calcium	37.12	49.23	43.51	50.55	2.17	<0.01	0.01	0.02
Phosphorus	34.65	39.44	47.60	47.68	3.64	0.05	0.01	0.02
Day 27 and 28
Dry matter	80.35	81.20	83.56	82.84	0.70	0.02	<0.01	0.07
Gross energy	80.90	81.26	85.74	81.76	0.83	<0.01	0.17	0.06
Crude protein	72.38	72.97	77.63	75.68	1.13	0.01	0.01	0.03
Neutral detergent fiber	48.51	59.36	59.66	58.02	1.85	<0.01	0.01	<0.01
Acid detergent fiber	49.91	56.39	58.64	57.18	2.20	0.05	0.03	0.02
Calcium	37.86	46.96	48.39	45.32	1.67	<0.01	0.02	<0.01
Phosphorus	43.26	47.49	50.25	48.25	1.63	0.04	0.03	0.02

¹Value represent the means of six pens with six pigs per pen.

²SEM = Standard error of the mean.