feed conversion ratio

Items	0.0 % (control)	*At Origanum vulgareextract % in the diet*
		0.50%	1.00%	1.50%
Feed intake	34.10 ± 0.34^c	39.74 ± 0.22^a	38.75 ± 0.36^a	37.29 ± 0.52^b
(g feed/fish)
FCR	2.01 ± 0.05^a	1.67 ± 0.07^b	1.72 ± 0.06^b	1.86 ± 0.04^ab

PER	1.81 ± 0.05^c	2.17 ± 0.08^a	2.05 ± 0.05^ab	1.94 ± 0.04^bc

APU %	28.37 ± 0.28^d	35.73 ± 0.20^a	34.08 ± 0.32^b	32.40 ± 0.45^c

AFU %	41.36 ± 0.40^d	50.76 ± 0.28^a	46.56 ± 0.42^b	44.14 ± 0.60^c

EU %	17.32 ± 0.17^c	21.84 ± 0.11^a	20.63 ± 0.22^b	20.40 ± 0.21^b

Feed intake, feed conversion ratio (FCR), protein efficiency ratio (PER), apparent protein utilization (APU), apparent fat utilization (AFU) and energy utilization (EU) of Nile tilapia fed diets containing different levels of Origanum vulgare extract. Means the same letter (a/b/c) in the same row is not significantly different at P<0.05.

Table 4: Feed intake, feed conversion ratio (FCR), protein efficiency ratio (PER), apparent protein utilization (APU), apparent fat utilization (AFU) and energy utilization (EU) of Nile tilapia fed diets containing different levels of Origanum vulgare extract.