Table 2 Effects of dietary threonine levels on the growth performance of sub-adult grass carp^g

IBW, g/fish

442.0 ± 5.1^a

441.6 ± 2.3^a

442.6 ± 1.7^a

442.2 ± 1.3^a

441.6 ± 3.0^a

441.4 ± 2.0^a

FBW, g/fish

623.4 ± 20.4^a

817.4 ± 11.1^b

911.8 ± 26.3^c

1,013.4 ± 35.2^e

969.0 ± 28.2^d

896.6 ± 41.7^c

WG, g/fish

181.4 ± 19.1^a

375.8 ± 10.8^b

469.2 ± 26.4^c

571.2 ± 34.2^e

527.4 ± 27.8^d

455.2 ± 42.8^c

SGR^h, %/day

0.61 ± 0.05^a

1.10 ± 0.02^b

1.29 ± 0.05^c

1.48 ± 0.06^d

1.40 ± 0.05^d

1.26 ± 0.09^c

FI, g/fish

464.4 ± 21.3^a

762.0 ± 14.9^b

926.1 ± 49.0^d

1,074.5 ± 29.5^f

1,023.0 ± 10.6^e

872.7 ± 5.4^c

FEⁱ, %

38.98 ± 2.44^a

49.35 ± 2.20^b

50.83 ± 4.80^b

53.22 ± 3.94^b

51.57 ± 2.90^b

52.17 ± 5.06^b

PER^j

1.39 ± 0.09^a

1.76 ± 0.08^b

1.81 ± 0.17 ^b

1.90 ± 0.14^b

1.84 ± 0.10 ^b

1.86 ± 0.18 ^b