Table 4.

Prececal crude protein and amino acid digestibility (%) of the experimental diets (8 replicates per treatment).

	Basal diet	Protease A		Protease B		Protease C		Phytase
Supplementation	No	25	200	500	4000	200	1600	1500	Pooled	P-value
level	enzyme	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	mg/kg	FTU/kg	SEM	ANOVA
CP	79.9b	80.4b	79.9b	78.6c	79.7b,c	78.5d	81.9a	81.9a	0.61	<0.001
Ala	80.8b	81.6b	80.7b	79.2c	80.4b,c	79.4c	83.2a	83.7a	0.71	<0.001
Arg	88.0b,c	88.3b	88.0b,c	86.9d	87.4c,d	86.9d	89.5a	89.5a	0.34	<0.001
Asp/Asn	78.8b,c	79.5b	79.1b,c	77.1d	78.1c,d	77.1d	80.9a	81.2a	0.50	<0.001
Cys	66.9b	67.5b	67.6b	64.6c	67.0b	64.8c	71.9a	70.8a	0.91	<0.001
Glu/Gln	86.1b,c	86.6b	86.2b,c	84.8d	85.6c,d	85.0d	87.7a	88.0a	0.41	<0.001
Gly	75.4b,c	76.1b	75.5b,c	73.7d,e	74.9c,d	73.5e	77.9a	78.3a	0.69	<0.001
His	79.8b,c	80.6b	80.1b	78.1d	80.1b	78.7c,d	82.7a	83.0a	0.67	<0.001
Ile	82.5b	82.5b	81.8b,c	80.6d	80.5d	80.8c,d	84.3a	84.4a	0.58	<0.001
Leu	82.7b,c	83.3b	82.6b,c	81.1d	82.1c,d	81.3d	85.1a	85.4a	0.62	<0.001
Lys	84.6b,c	84.9b	84.2b–d	83.3d	83.8c,d	83.2d	85.9a	86.8a	0.53	<0.001
Met	84.1b	84.6b	83.6b,c	82.4c	83.7b,c	83.3b,c	86.8a	87.4a	0.73	<0.001
Phe	83.0b,c	83.7b	83.1b,c	81.5d	82.2b,c	81.9d	85.6a	85.6a	0.55	<0.001
Pro	79.6b,c	80.6b	80.6b	78.2d	80.2b	78.5c,d	83.0a	81.9a	0.66	<0.001
Ser	77.8c	79.0b	78.4b,c	76.4d	77.9b,c	76.4d	81.2a	81.6a	0.63	<0.001
Thr	73.3b	74.2b	73.5b	71.3c	72.9b	71.0c	76.1a	76.6a	0.78	<0.001
Tyr	80.6b,c	81.5b	80.9b,c	79.1d	80.7b,c	80.0c,d	84.1a	83.5a	0.64	<0.001
Val	80.6b	80.2b	79.7b	78.4c	78.5c	78.4c	82.2a	82.3a	0.68	<0.001

^a–eValues without a common superscript within 1 row are significantly different (P < 0.050).