الفهرس 
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Abstract
Experiments of the present study were carried out at the Rabbits Farm of Sakha Station, Animal Production Research Institute, Agriculture Research Center, Egypt, during the period from October 2016 to March 2016. It aimed to investigate the effects of supplementing Gum Arabic as prebiotic on growth performance, digestibility, some blood parameters, carcass characteristics, caecal microbial activity and economical efficiency of growing APRI-Line rabbits. Six experimental diets were formulated to cover all essential nutrient requirements for growing rabbit. Dietary Gum Arabic level had no significant differences in feed intake (g/ d) during the experimental period. Experimental treatment received 1.0 and 1.5 GA in diets had lower feed conversion ratio as compared with those received control treatment (3.065 and 3.015 vs. 3.397 g FI/ g DWG; P<0.001, respectively). Using of GA in growing rabbits diet decreased mortality rate by 44.4% (As average), as compared with control diet. Rabbits diets containing 1.0 and 1.5% GA had the highest carcass weight percentage; while those fed control diet had the lowest value (50.3 and 50.5% vs. 47.5%, P<0.05, respectively). Serum total protein, albumin and globulin significantly increased with increasing GA level in the diet. Serum cholesterol and triglyceride significantly decreased (P<0.01 & P<0.001, respectively) by increasing GA level in diet. The best value of relative revenue was found in the rabbits received 1.0% GA diet (112.6%), followed by those received 1.5% GA diet (110.9%), but the poorest value was recorded for control group (100%). Therefore, it may be concluded that Gum Arabic could be successfully incorporated into the diet of growing rabbits up to 1.5%. However, Arabic Gum 1.0% improved production performance and some physiological indices through alleviate post weaning stress with high profitability, under Egyptian environmental conditions.