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. 2021 Mar 7;7(2):556–568. doi: 10.1016/j.aninu.2020.07.009

Table 3.

Growth performance, head kidney and spleen weight, index of grown-up grass carp (Ctenopharyn-godon idellus) fed diets containing graded levels of lysine for 60 d.

Item Dietary lysine level, g/kg diet
5.6 8.5 11.6 14.4 17.5 20.7
IBW1, g/fish 164.33 ± 0.33a 164.89 ± 1.07a 165.00 ± 0.88a 165.44 ± 0.38a 164.89 ± 1.02a 164.56 ± 1.02a
FBW1, g/fish 403.33 ± 3.53a 485.33 ± 3.72c 581.33 ± 4.00f 549.78 ± 13.23e 515.33 ± 5.92d 442.22 ± 10.12b
PWG1, % 144.20 ± 2.11a 192.62 ± 3.36c 250.01 ± 2.80f 230.21 ± 8.24e 210.59 ± 4.13d 167.22 ± 5.56b
SGR1, %/d 1.49 ± 0.01a 1.79 ± 0.02c 2.09 ± 0.01f 1.99 ± 0.04e 1.89 ± 0.02d 1.64 ± 0.03b
FI1, g/fish 454.47 ± 0.30a 527.02 ± 0.28c 606.50 ± 0.25f 579.18 ± 0.30e 541.55 ± 0.26d 471.06 ± 0.30b
FE1, % 0.52 ± 0.01a 0.61 ± 0.01b 0.68 ± 0.01d 0.66 ± 0.02cd 0.65 ± 0.01c 0.59 ± 0.02b
HKW2, g 0.71 ± 0.01a 0.96 ± 0.05b 1.29 ± 0.06d 1.23 ± 0.02d 1.05 ± 0.04c 0.88 ± 0.06b
HKI2, % 0.18 ± 0.00a 0.20 ± 0.01ab 0.22 ± 0.02cd 0.23 ± 0.00d 0.21 ± 0.01bc 0.20 ± 0.01ab
SW2, g 0.55 ± 0.03a 0.80 ± 0.03b 1.00 ± 0.02c 0.99 ± 0.08c 0.82 ± 0.03b 0.63 ± 0.01a
SI2, % 0.14 ± 0.01a 0.17 ± 0.01cd 0.17 ± 0.02cd 0.18 ± 0.01d 0.16 ± 0.00bc 0.14 ± 0.00ab
Regressions
YPWG = −1.495X2 + 40.617X – 36.919 R2 = 0.970 P < 0.05
YSGR = −0.008X2 + 0.231X + 0.463 R2 = 0.956 P < 0.01
YFE = −0.211X2 + 5.916X + 26.061 R2 = 0.957 P < 0.01
YHKI = -0.001X2 + 0.018X + 0.096 R2 = 0.909 P < 0.05
YSI = −0.001X2 + 0.019X + 0.055 R2 = 0.933 P < 0.05

IBW = Initial body weight; FBW = final body weight; PWG = percent weight gain; SGR = specific growth rate; FI = feed intake; FE = feed efficiency; HKW = head kidney weight; HKI = head kidney index; SW = spleen weight; SI = spleen index.

a to f Values with different letter superscripts are significantly different (P < 0.05).

1

Values are means ± SD for 3 replicate groups, with 30 fish in each group.

2

Values are means ± SD (n = 12).