الفهرس 
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Abstract
Two experiments were conducted to assess the beneficial role of navel orange peel extract (NPE), organic selenium (OSE), or their mixture, as an antioxidant feed additive, in alleviating heat stress impacts in rabbits during summer season of Egypt. The rabbits of the 1st experiment were distributed into five groups. Rabbits of the first group fed the basal diet and reared in the winter, while the other four groups were reared in the summer and fed the basal diet fortified with 0 (S-NPE-0), 250 (S-NPE-250), 500 (S-NPE-500), or 1000 (S-NPE-1000) mg NPE/kg diet. The rabbit groups of the 2nd experiment were the control (fed a basal diet) or supplemented with NPE (1000 mg/kg diet), OSE (0.3 mg/kg diet), and OPE + OSE at the same levels. The results of 1st trial indicated that thermal-stressed rabbits (S-NPE-0) had significant adverse effects on feed intake and growth performance, hematological indices, serum lipid profile, antioxidative status, and lipid peroxidation compared to the W-NPE-0 group. However, the highest final weight and feed intake were recorded in the S-NPE-1000 group compared with the S-NPE-0 group. Also, supplemental NPE in the growing rabbit diet, especially the S-NPE-1000 group, enhanced the hematological and antioxidative indicators. The results of 2nd trial showed that growth performance, crude fiber digestibility, serum reduced glutathione and economic efficiency were greater in rabbits fed NPE and NPE+OSE diets compared with those fed the control diet. Rabbits fed OSE diet showed better ether extract digestibility than other groups. However, the serum concentrations of total triglycerides and low-density lipoprotein were decreased in the NPE and NPE+OSE supplemented groups. In conclusion, NPE or NPE+ OSE supplementation in rabbit diets could be used to efficiently mitigate the detrimental effects of chronic temperature stress on performance, hematobiochemical features, and oxidative stability.