Table 4 Effects of dietary threonine levels on IL, RGL, IW, ISI, IPC, HW, HSI, and HPC of sub-adult grass carp

IL^f, cm /fish

58.1 ± 5.9^a

58.5 ± 2.9^a

61.8 ± 3.2^ab

63.9 ± 3.5^b

61.7 ± 3.2^ab

59.6 ± 5.0^a

RGL^f, %

149.0 ± 18.1^a

144.4 ± 7.6^a

144.6 ± 8.1^a

145.5 ± 7.7^a

145.3 ± 7.7^a

147.3 ± 10.8^a

IW^f, g /fish

6.3 ± 0.8^a

9.8 ± 1.6^bc

10.9 ± 1.6^cd

14.0 ± 2.7^e

11.8 ± 1.5^d

9.2 ± 1.0 ^b

ISI^f, %

1.04 ± 0.13^a

1.24 ± 0.21^b

1.16 ± 0.12^b

1.26 ± 0.18^b

1.25 ± 0.15^b

1.16 ± 0.12^b

IPC^g, %

8.33 ± 0.63 ^a

9.57 ± 1.01^bc

10.21 ± 1.02^c

8.90 ± 0.73^ab

8.71 ± 0.89^ab

8.49 ± 0.90^ab

HW^f, g /fish

12.1 ± 2.1^a

16.9 ± 2.5^b

23.7 ± 5.7^c

26.3 ± 7.1^c

23.4 ± 3.6^c

16.5 ± 3.3^b

HSI^f, %

1.98 ± 0.27^a

2.14 ± 0.35^ab

2.51 ± 0.54^c

2.37 ± 0.48^bc

2.49 ± 0.39^c

2.08 ± 0.36^ab

HPC^g, %

9.46 ± 0.50^a

9.12 ± 0.68^a

11.61 ± 0.79^c

10.60 ± 0.65^b

11.15 ± 0.42^bc

10.98 ± 0.97^bc