Origanum vulgar LevelsĀ  in experimental rations
Items Control-0.0 0.50% 1% 1.50%
Price/kg feed P.T 2.78 2.93 3.08 3.23
FCR (kg feed/kg gain) 2.01 1.67 1.72 1.86
Feed cost/kg gain P.T 5.59 4.89 5.3 6.01
Reduction cost in kg gain 100 12.52 5.19 -7.51
Table 6: Economic efficiency for production of one Kg gain of fingerlings Nile tilapia O. niloticus fed diets containing different levels of extracted Origanum vulgare.