Cottonseed Meal Protein Hydrolysate Improves the Growth Performance of Chinese Mitten Crab (Eriocheir sinensis) by Promoting the Muscle Growth and Molting Performance

Table 6

Effect of dietary cottonseed meal protein hydrolysate levels on the muscle amino acid composition (mg/g tissue wet weight) in the E. sinensis.

Amino acids	CPH0	CPH0.2	CPH0.4	CPH0.8	CPH1.6	CPH3.2	Polynomial contrasts
							Linear	Quadratic
EAA
Threonine	7.73 ± 0.10	7.60 ± 0.08	7.54 ± 0.06	7.61 ± 0.14	7.83 ± 0.06	7.59 ± 0.11	ns	ns
Valine	7.70 ± 0.12	7.77 ± 0.13	7.65 ± 0.08	7.76 ± 0.14	7.90 ± 0.04	7.74 ± 0.16	ns	ns
Methionine	4.75 ± 0.08	4.61 ± 0.10	4.89 ± 0.09	4.63 ± 0.01	4.72 ± 0.14	4.55 ± 0.07	ns	ns
Isoleucine	6.28 ± 0.11	6.16 ± 0.18	6.01 ± 0.18	6.02 ± 0.21	5.94 ± 0.07	6.09 ± 0.07	ns	ns
Leucine	11.20 ± 0.05	11.17 ± 0.26	11.22 ± 0.20	10.89 ± 0.17	11.29 ± 0.07	11.08 ± 0.23	ns	ns
Phenylalanine	6.67 ± 0.05	7.19 ± 0.21	7.07 ± 0.27	6.76 ± 0.24	6.98 ± 0.13	7.35 ± 0.15	ns	ns
Lysine	11.18 ± 0.44	11.68 ± 0.41	11.10 ± 0.43	11.80 ± 0.24	11.36 ± 0.22	11.49 ± 0.15	ns	ns
Histidine	4.19 ± 0.27	3.89 ± 0.18	4.15 ± 0.15	3.97 ± 0.29	4.33 ± 0.13	3.90 ± 0.18	ns	ns
Arginine	16.29 ± 0.39	16.24 ± 0.36	16.57 ± 0.09	16.58 ± 0.26	17.08 ± 0.50	16.88 ± 0.23	ns	ns
Σ EAA	75.98 ± 1.11	76.31 ± 0.29	76.22 ± 0.60	76.02 ± 0.45	77.87 ± 0.58	76.56 ± 0.76	ns	ns
NEAA
Asparagine	15.45 ± 0.08	15.44 ± 0.10	15.38 ± 0.14	15.41 ± 0.06	15.48 ± 0.01	15.55 ± 0.03	ns	ns
Serine	7.33 ± 0.17	6.63 ± 0.15	7.14 ± 0.15	6.66 ± 0.41	6.86 ± 0.20	6.84 ± 0.21	ns	ns
Glutamic acid	25.65 ± 0.49	25.40 ± 0.18	25.01 ± 0.26	26.41 ± 0.26	25.72 ± 0.61	25.73 ± 0.42	ns	ns
Glycine	10.45 ± 0.07	10.20 ± 0.21	10.48 ± 0.16	10.43 ± 0.37	10.47 ± 0.08	10.35 ± 0.15	ns	ns
Alanine	12.20 ± 0.15	11.92 ± 0.15	12.37 ± 0.11	12.23 ± 0.27	12.65 ± 0.14	12.51 ± 0.16	ns	ns
Cysteine	2.00 ± 0.14	1.88 ± 0.04	1.83 ± 0.13	2.13 ± 0.09	1.87 ± 0.08	1.82 ± 0.20	ns	ns
Tyrosine	6.23 ± 0.18	6.61 ± 0.33	6.73 ± 0.12	6.94 ± 0.25	6.84 ± 0.15	6.68 ± 0.25	ns	ns
Proline	7.51 ± 0.08	7.25 ± 0.14	7.25 ± 0.17	7.05 ± 0.07	7.43 ± 0.14	7.51 ± 0.06	ns	ns
Σ NEAA	86.82 ± 0.91	85.33 ± 0.78	86.20 ± 0.67	87.26 ± 0.59	86.98 ± 0.79	86.65 ± 0.31	ns	ns
Σ AA	162.80 ± 2.00	161.64 ± 0.85	162.42 ± 1.17	163.28 ± 0.86	165.54 ± 0.25	163.15 ± 0.25	ns	ns

Values are means ± SEM of three replicates. Means in the same row with different superscript letters are significantly different (). ns, not significant. CPH, cottonseed meal protein hydrolysate; CPH0 to CPH3.2, dietary cotton meal replacement by 0%, 0.2%, 0.4%, 0.8%, 1.6%, and 3.2% of CPH; Σ EAA, total essential amino acids; Σ NEAA, total nonessential amino acids; Σ AA, total amino acids; SEM, standard error of mean.