الفهرس | Only 14 pages are availabe for public view |
Abstract The current study compared the effect of dietary supplementation of potential antioxidants (vitamin E, selenium and hydrolysable tannins) on growth performances, carcass traits, and some blood serum metabolites of seventy growing NZW rabbits reared during summer season (31.31±2°C).Weaned rabbits were equally distributed among seven dietary experimental treatments and fed ad libitum for eight weeks; a basal diet without supplemented antioxidants served as a control, the other six diets contained 100 or 200 mg vitamin E/kg diet, 0.1 or 0.2 mg Se/kg diet, 1.5 or 3.0 g hydrolysable tannins/kg diet. Results indicated that total live weight gain was not significantly affected by dietary treatments. Feed intake was significantly higher in control followed by vitamin E (100 mg/kg) groups, compared to other treatments. Feed conversion ratio was improved (P<0.05) with 0.1 mg Se/kg diet (14.2%) and with 1.5 g tannins/kg diet (16.1%) compared to the control. None of the studied dietary supplements significantly affected carcass traits or blood serum metabolites of the rabbits. In summer season, the dietary supplementation with vitamin E (100 mg/kg), selenium (0.1mg/kg diet) or tannins (1.5 g/kg diet) only improve rabbits feed conversion ratio. Key words: Rabbit, vitamin E, selenium, tannins, summer, growth. |