Increasing Phosphorus Digestibility in Common Carp (Cyprinus carpio L.) Farming Using Phytase and Citric Acid

Table 3

Fish production parameters.

Parameter	C	L	H	LA	HA
FCR^1	2.44 ± 0.01^a	2.52 ± 0.09^a	2.46 ± 0.13^a	1.97 ± 0.06^b	1.97 ± 0.08^b
SGR^1	0.99 ± 0.02^a,b	0.91 ± 0.05^a	0.91 ± 0.03^a	1.09 ± 0.03^b,c	1.12 ± 0^c
PER^1	1.62 ± 0^a	1.67 ± 0.03^a	1.72 ± 0.04^a	2.17 ± 0.03^b	2.23 ± 0.05^b
aNPU^1	54.71 ± 0.78^a,b	49.27 ± 2.51^a	51.6 ± 1.98^a	59.38 ± 1.73^b	85.72 ± 1.98^c
LR^1	443.94 ± 3.63^a	397.66 ± 5.11^b	453.79 ± 8.53^a	513.61 ± 4.94^c	602.9 ± 6.43^d
WG (g)^1	2014.5 ± 118.1^a,b	1807 ± 125.87^a	1803 ± 41.01^a	2334.5 ± 79.9^b,c	2456.5 ± 43.13^c
WG (%)^1	100.69 ± 3.63^a,b	90 ± 5.85^a	90.52 ± 2.45^a	115.97 ± 3.4^b,c	120.65 ± 1.28^c
HSI^2	2.15 ± 0.45	2.29 ± 0.41	2.08 ± 0.39	2.05 ± 0.44	2.16 ± 0.24
VSI^2	10.34 ± 1.38	10.1 ± 1.13	12.85 ± 9.72	9.41 ± 1.36	10.86 ± 2.29

Data represent mean ± SD (C, control; L, low enzyme concentration; H, high enzyme concentration; LA, low enzyme concentration with citric acid, HA, high enzyme concentration with citric acid). FCR, feed conversion ratio; SGR, specific growth rate; PER, protein efficiency ratio; aNPU, apparent net protein utilisation; LR, lipid retained; WG, weight gain; HSI, hepatosomatic index; VSI, viscerosomatic index. Significant differences (one-way ANOVA for all parameters except HSI and VSI, where hierarchical ANOVA was used) are indicated by different indices (a, b, c). ¹n = 2. ²n = 15.