Optimal Niacin Requirement of Oriental River Prawn Macrobrachium nipponense as Determined by Growth, Energy Sensing, and Glycolipid Metabolism

Table 3

Growth performance and feed utilization of oriental river prawn fed diets differing in niacin levels.

Dietary niacin levels (mg/kg)	IW (g)	FW (g)	SR (%)	WG (%)	SGR (%/day)	FI (g)	FCR	PER
15.75	0.17 ± 0.01	0.55 ± 0.02^a	70.50 ± 4.08	81.61 ± 12.93^a	0.84 ± 0.10^a	1.16 ± 0.18^a	4.30 ± 0.35^b	1.16 ± 0.17^a
37.62	0.18 ± 0.01	0.57 ± 0.02^a	83.53 ± 4.93	117.83 ± 11.73^ab	1.21 ± 0.12^ab	2.00 ± 0.26^ab	3.40 ± 0.23^ab	2.00 ± 0.26^ab
56.62	0.19 ± 0.01	0.62 ± 0.01^ab	82.38 ± 3.44	134.97 ± 8.99^ab	1.11 ± 0.07^ab	1.69 ± 0.16^ab	3.53 ± 0.16^ab	1.69 ± 0.16^ab
97.78	0.16 ± 0.01	0.61 ± 0.02^ab	85.50 ± 3.39	145.92 ± 8.33^ab	1.23 ± 0.08^ab	1.98 ± 0.15^ab	3.32 ± 0.10^a	1.98 ± 0.15^ab
176.32	0.17 ± 0.01	0.70 ± 0.03^b	88.62 ± 2.13	179.93 ± 23.77^b	1.46 ± 0.12^b	2.47 ± 0.36^b	3.11 ± 0.15^a	2.47 ± 0.36^b
339.28	0.20 ± 0.01	0.64 ± 0.04^ab	81.75 ± 7.25	138.19 ± 18.38^ab	1.27 ± 0.11^ab	2.17 ± 0.28^ab	3.30 ± 0.15^a	2.17 ± 0.28^ab
Polynomial contrasts
Linear	ns		ns
Quadratic	ns	ns	ns	ns	ns	ns		ns
Cubic	ns	ns	ns	ns	ns	ns	ns	ns

IW: initial weight; FW: final weight; SR: survival rate; WG: weight gain; SGR: specific growth rate; FI: feed intake; FCR: feed conversion ratio; PER: protein efficiency ratio. Data are represented as means ± S.E.M ( =4). Values in the same column with different superscripts are significantly different (). ns; not significant.