الفهرس 
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Abstract
Experiments of the present study were carried out at Rabbitary Farm of Sakha, Animal Production Research Station, Animal Production Research Institute (APRI), Agriculture Ministry, Egypt during the period from September to December 2015. It aimed to investigate the effect of using different levels of sugarcane bagasse (SCB) and sugar beet pulp (SBP) with or without enzyme in diets of growing APRI line rabbits on the productive performance, digestibility of nutrients, caecotrophy, some blood constituents and economic efficiency. Nine experimental diets were formulated to cover all essential nutrient requirements for growing rabbit. One hundred and forty-four APRI rabbits were divided randomly into nine experimental groups of 16 rabbits each (8 males + 8 females) of 5 weeks of age with an average live body weight of (723 ± 2 gm.), were used in this study. Rabbits were equal, with respect to body weight and sex. Criteria of response were: Body weight, feed intake, feed conversion, performance index, Mortality rate, Digestibility, Caecotrophy, Carcass traits, Chemical composition of meat and Biochemical trait of blood. Results obtained could be summarized as follows: (1) There were no significant differences in body weight between rabbits fed SBP diet and rabbits fed control diet, while those fed SCB diet had the lowest body weight. (2) Using Kemzyme increased the body weight insignificantly, except in weeks 10, 11 and 12, which Kemzyme significantly (P<0.05) increased body weight. (3) During the whole experimental period (5-13 weeks of age), rabbits fed SCB diets recorded significantly the lower daily body weight gain, as compared with those fed SBP and control diet (23.56 vs. 25.43 and 25.41 g, P<0.001, respectively). (4) Supplementing Kemzyme in diets had no significant differences on daily weight gain in all experimental periods (5-9 weeks, 9-13 weeks and the whole experimental period 5-13 weeks). (5) Feed intake in the whole period (5-13 weeks of age) significantly decreased by 3.5 and 5.1% for rabbits fed SBP and SCB diets, respectively, as compared with those fed control diet. Moreover, feed intake was decreased by 1.95% with adding Kemzyme during the whole experimental period. (6) In the whole experimental period (5-13 weeks of age), feed conversion ratio was significantly improved with rabbits fed SBP diets, as compared with those fed control diet. from our results can be concluded that it is possible to include up to 47.8 % of sugar beet pulp with or without kemzyme in growing rabbit’s diets with significant increase in growth performance and economic efficiency, while it is possible to include up to 9.54% of sugarcane bagasse with kemzyme in growing rabbit’s diets without significant differences in growth performance or economic efficiency.