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Effect of different antioxidants supplementation (g/kg diet) on changes of luteinizing hormone (A), testosterone levels (B) and testis somatic index (C) as a percent of the control of male Nile tilapia, O. niloticus. GE, ginseng extract; TT, Tribulus terrestris extract; DPPG, date palm pollen grains. (n = 15) ns: non significant, 0.05–0.001 the t-test significant levels of actual parameter values.
