Table 2. Amino acid composition of the diets (g kg⁻¹ dry weight for free amino acid and % for hydrolytic amino acids).

Items	Diets
	SPC0		SPC15		SPC 30		SPC45		SPC60		SPC75
	hydrolytic	free	hydrolytic	free	hydrolytic	free	hydrolytic	free	hydrolytic	free	hydrolytic	free
Polar basic amino acids
Lysine	2.41	0.75	2.24	0.64	2.31	0.73	2.20	0.63	2.12	0.48	1.98	0.36
Arginine	2.26	0.56	2.26	0.56	2.44	0.74	2.47	0.74	2.67	0.73	2.59	0.69
Histidine	0.62	0.66	0.68	0.64	0.70	0.50	0.72	0.45	0.78	0.37	0.79	0.25
Polar acidic amino acids
Aspartic acid	3.89	0.48	3.96	0.43	4.23	0.39	4.37	0.34	4.54	0.29	4.56	0.21
Glutamic acid	6.43	0.93	6.55	0.79	6.99	0.75	7.29	0.62	7.71	0.47	7.76	0.36
Non-polar amino acids
Isoleucine	1.11	0.68	1.03	0.54	1.10	0.57	1.12	0.47	1.05	0.36	0.85	0.24
Leucine	3.10	1.32	2.93	1.06	3.09	1.17	3.09	0.97	3.12	0.73	2.91	0.50
Valine	1.26	0.93	1.23	0.76	1.23	0.79	1.27	0.65	1.15	0.49	1.13	0.32
Glycine	2.82	0.65	2.59	0.44	2.48	0.42	2.37	0.34	2.29	0.28	2.00	0.21
Alanine	2.90	1.87	2.68	1.55	2.62	1.49	2.51	1.21	2.47	0.90	2.18	0.63
Phenylalanine	1.49	0.49	1.52	0.40	1.63	0.41	1.66	0.35	1.75	0.28	1.73	0.19
Polar neutral amino acids
Tryptophan	na	na	na	na	na	na	na	na	na	na	na	na
Methionine	0.85	0.27	0.63	0.25	0.74	0.20	0.73	0.19	0.61	0.07	0.49	0.05
Serine	1.81	0.25	1.85	0.22	1.98	0.20	2.12	0.17	2.19	0.14	2.21	0.10
Threonine	1.55	0.33	1.62	0.28	1.52	0.28	1.47	0.23	1.51	0.18	1.49	0.12
Tyrosine	0.55	0.29	0.62	0.24	0.73	0.23	0.74	0.20	0.78	0.15	0.73	0.11
Taurine	0.23	1.68	0.19	1.31	0.18	1.24	0.15	0.98	0.09	0.67	0.07	0.43
Cysteine	0.26	0.35	0.25	0.42	0.30	0.45	0.32	0.60	0.35	0.95	0.31	1.20
ΣEAA(1)	14.65	5.97	14.17	5.12	14.75	5.40	14.72	4.68	14.76	3.68	13.95	2.72
ΣNEAA(2)	18.80	6.50	18.90	5.40	19.50	5.15	19.78	4.45	20.41	3.85	19.80	3.06
EAA/NEAA	0.8	0.9	0.8	1.0	0.8	1.1	0.7	1.1	0.7	1.0	0.7	0.9

⁽¹⁾ ΣEAA: sum of essential amino acids

⁽²⁾ ΣNEAA: sum of non-essential amino acids