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Table 5 Amino acid (g kg− 1) profile of Catla catla fed with C. sinensis-supplemented diets

From: Effect of dietary Citrus sinensis peel extract on growth performance, digestive enzyme activity, muscle biochemical composition, and metabolic enzyme status of the freshwater fish, Catla catla

Amino acids

Dietary supplementary of C. sinensis g kg− 1

Control

2.00 (diet 1)

6.00 (diet 2)

10 (diet 3)

Essential

Histidine

1.40 ± 0.19a

1.46 ± 0.39a

1.52 ± 0.25a

1.41 ± 0.26a

Isoleucine

1.35 ± 0.43b

1.72 ± 0.09ab

1.87 ± 0.11a

1.66 ± 0.13ab

Leucine

3.14 ± 0.80a

3.46 ± 0.11a

3.64 ± 0.25a

3.20 ± 0.61a

Lysine

0.48 ± 0.01c

1.10 ± 0.02ab

1.25 ± 0.16a

1.07 ± 0.03b

Methionine

1.31 ± 0.31b

1.67 ± 0.16ab

1.82 ± 0.16a

1.61 ± 0.20ab

Phenylalanine

1.56 ± 0.30b

1.71 ± 0.04a

1.81 ± 0.09a

Trace

Threonine

3.63 ± 0.29c

4.62 ± 0.06ab

5.01 ± 0.36a

4.45 ± 0.12b

Tryptophan

5.02 ± 0.16c

5.52 ± 0.01ab

5.82 ± 0.16a

5.11 ± 0.37bc

Valine

1.65 ± 0.17c

1.91 ± 0.02ab

1.97 ± 0.01a

1.80 ± 0.01bc

Conditionally essential

Arginine

4.36 ± 0.04c

4.57 ± 0.18b

4.81 ± 0.04a

4.55 ± 0.04b

Cysteine

1.66 ± 0.29a

1.91 ± 0.06a

1.97 ± 0.01a

1.81 ± 0.16a

Glutamine

1.63 ± 0.14b

1.87 ± 0.12a

1.93 ± 0.05a

1.77 ± 0.11ab

Glycine

1.88 ± 0.10c

4.31 ± 0.44ab

4.88 ± 0.10a

4.17 ± 0.40b

Proline

1.90 ± 0.22a

1.99 ± 0.00a

2.08 ± 0.76a

1.91 ± 0.07a

Tyrosine

2.15 ± 0.74b

2.74 ± 0.14ab

2.97 ± 0.01a

2.63 ± 0.21ab

Non-essential

Alanine

1.47 ± 0.25a

1.54 ± 0.08a

1.62 ± 0.17a

1.53 ± 0.04a

Aspartic acid

0.19 ± 0.01b

1.84 ± 0.11a

2.01 ± 0.50a

1.69 ± 0.07a

  1. Mean values within the same row sharing the same superscript are not significantly different (P ˃ 0.05), Citrus sinensis-free diet; n = 3 (three samples from each treatment), mean ± SD