الفهرس 
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Abstract
This study was designed to investigate the effect of feeding New Zealand White rabbits on grade levels 10, 13, 16 and 19% of crude fiber incorporated with or without some enzymes (Caplix enzymes) supplementation at the level of 0.5 ml / 1 litter water .A total number of 32 unsexed, 35-40 day old growing Wight New Zealand rabbits were randomly distributed into eight experimental groups, Each group contain four replicates of four rabbits in each replicate. The rabbits were housed in battery cages ( 45 × 45 × 38 cm ). Feed and water given to the rabbits ad-libitum during the experimental periods. Rabbits were distributed to eight dietary treatments according to fiber level in the diet or enzymes addition .Four groups of these rabbits were fed dietary fiber at levels of 10, 13, 16 and 19% without enzymes addition . The other four groups were fed the same previous levels of crude fiber with 0.5ml ( Caplix) enzymes /1 litter water for each treatment group. Live body weight and feed intake for each rabbit / day during the experimental periods was recorded . Body weight gain and feed conversion (g, feed/ g, gain) was calculated. Nutrient digestion coefficinecy of experimental diets were carried out at the final of the experimental period. At the end of experimental period (12 weeks) blood sample were collected. from three rabbits of each treatment in unheparinized tube. Then, these samples for each rabbit were centerifugated at 3000 rpm / min to obtain blood serum. The serum was stored at -20 º C till chemical analysis.
The data could be summarized as follows:-
1- Adding enzymes improved live body weight in the presence of low fiber levels in the diet (10, 13 % C.F.). Moreover, the lowest ( P<0.05) live body weight was recorded for rabbits fed diet contain 19% CF without enzymes addition.
2- Adding enzymes improved body weight gain for rabbits fed dietary 10% CF during the entire period (0 to 12 weeks of treatments).
3- New Zealand White rabbits fed dietary crude fiber at all levels (10, 13, 16 and 19 % ) with (Caplix) enzymes reduced (P<0.05) feed intake compared with other same dietary crude fiber without (Caplix) enzymes additions, during all experimental period (0 to 4, 0 to 8 and 0 to 12 weeks of treatments).
4- Feeding New Zealand White rabbits on dietary fiber 10 or 13 % CF either with or without providing enzymes improved feed conversion efficiency compared with rabbits fed high fiber diets (16 and 19% CF ).
5- Rabbits fed on dietary crude fiber (10%) and provided with (Caplix ) enzymes at the level of 0.5 ml / 1 litter water recorded better (P<0.05) values of DM, OM, and CP digestibility compared with other dietary fiber.
6- Rabbits fed low level of dietary crude fiber (10%) and provided with (Caplix ) enzymes recorded the greatest (P<0.05) values of TP (g/dl), TG (g/dl) and glucose (mg/dl) compared with other levels of dietary CF which provided with (Caplix ) enzymes. whereas, rabbits fed dietary 13% CF with enzyme addition were recorded the highest (P<0.05) value of TA (g/dl). Rabbits fed dietary 10% CF without (Caplix) enzymes presented better (P>0.05) value of TA (g/dl) followed by dietary 19% CF compared with other dietary treatments. Blood serum glucose (mg/dl) for rabbits fed dietary (10% and 13% CF) and provided with enzymes was improved (P<0.05) compared with rabbits fed dietary (16 and 19%).
7- The better value of (GOT) and (GPT) was recorded for rabbits fed dietary 16% CF followed by 13% CF with providing (Caplix) enzymes compared with other dietary fiber treatments at the same level of enzyme. the total lipids (P<0.05) improvement shown in rabbits fed diet contain 10% CF with enzyme providing compared with other different dietary levels of fiber. The greatest (P<0.05) total lipids value was recorded for rabbits fed diet contain (10% CF) in the treatments without enzyme addition.
8- The greatest total revenue and profit were calculated for rabbits fed diet contain 10% crude fiber and provided with enzymes addition compared with other dietary treatments. In the other hand, rabbits fed dietary crude fiber without enzymes recorded the highest revenue when rabbits fed 13% CF without enzyme addition