Table 2.

The growth performance of grass carp fed with different dietary protein

Items	Dietary protein levels						Linear		Quadratic
	15.91%	19.39%	22.10%	25.59%	28.53%	31.42%	F	P	F	P
IBW, g	721.60 ± 1.60	720.80 ± 1.60	722.13 ± 1.85	720.00 ± 2.12	721.87 ± 3.03	720.53 ± 2.44	0.17	0.69	0.00	0.96
FBW, g	1176.00 ± 34.06a	1233.99 ± 108.08ab	1381.60 ± 56.30c	1333.60 ± 96.64bc	1327.02 ± 60.66bc	1331.94 ± 27.76bc	8.82	< 0.05	5.59	< 0.05
PWG, %	62.98 ± 4.94a	71.20 ± 15.13ab	91.34 ± 8.27c	85.23 ± 13.50bc	83.81 ± 7.65bc	84.85 ± 3.26bc	8.93	< 0.05	5.58	< 0.05
SGR, %/d	0.81 ± 0.05a	0.89 ± 0.15ab	1.08 ± 0.07c	1.02 ± 0.12bc	1.01 ± 0.07bc	1.02 ± 0.03bc	9.38	< 0.01	5.46	< 0.05
FI, g	993.85 ± 0.60a	1043.83 ± 2.83c	1233.27 ± 1.01f	1141.44 ± 1.22e	1065.50 ± 1.72d	1004.09 ± 0.40b	10.91	< 0.01	40,066.6	< 0.01
FE, %	45.72 ± 3.52a	49.18 ± 10.50ab	53.47 ± 4.66ab	53.75 ± 8.46ab	56.80 ± 5.47ab	60.89 ± 2.56b	9.99	< 0.01	0.00	0.96

Values are means ± SD and n = 3 for each group. ^a-f Different superscripts in the same row indicate significantly difference (P < 0.05)