Table 8.

Apparent prececal AA digestibility in corn–soybean meal- or corn–soybean meal–rapeseed cake-based basal diet without or with the supplementation of phytase, % (Exp. 2)¹

	BDSBM2		BDRSC3			P-value
Phytase:	0	1,500	0	1,500	SEM	Protein source	Phytase	Protein source × phytase
Indispensable amino acids
Arg	89.2	89.1	83.2	84.4	0.5	<0.001	0.177	0.131
His	81.5	80.2	75.3	75.8	0.9	<0.001	0.448	0.191
Ile	85.3	84.6	76.1	77.1	0.8	<0.001	0.939	0.259
Leu	84.7	84.0	78.4	78.9	0.8	<0.001	0.774	0.348
Lys	82.4	81.5	74.7	75.9	0.8	<0.001	0.992	0.130
Met	84.9	84.2	81.1	81.2	1.0	0.001	0.654	0.603
Phe	85.5	85.3	77.9	79.1	0.7	<0.001	0.478	0.288
Thr	74.9	73.8	65.2	65.7	1.2	<0.001	0.684	0.432
Trp	77.3	76.4	68.8	70.5	1.2	<0.001	0.750	0.219
Val	82.1	80.9	72.8	73.6	0.9	<0.001	0.638	0.201
Dispensable amino acids
Ala	79.0	78.1	72.5	73.0	1.2	<0.001	0.633	0.396
Asx4	79.6	79.5	72.1	73.1	0.8	<0.001	0.523	0.403
Cys	71.2	67.8	70.0	70.5	1.4	0.582	0.280	0.142
Glx4	83.0	83.0	81.3	82.5	0.9	0.070	0.362	0.426
Gly	69.4	68.8	61.9	63.3	1.2	<0.001	0.604	0.172
Pro	78.2	78.3	74.1	75.3	1.6	0.003	0.676	0.549
Ser	80.4	80.1	70.7	71.5	1.0	<0.001	0.829	0.551
Tyr	84.3	83.6	75.3	75.7	1.0	<0.001	0.674	0.419

¹Data are given as LSMeans and pooled SEM (untransformed data).

²Corn–soybean meal-based basal diet.

³Corn–soybean meal–rapeseed cake-based basal diet.

⁴Asp, Asn, and Glu, Gln, respectively, were detected together because the side groups of Asn and Gln are lost during acid hydrolysis (Fontaine, 2003).