الفهرس 
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Abstract
This study was conducted at the Nutrition and Veterinary Clinical Nutrition Department. Faculty of Veterinary Medicine, Alexandria University to investigate the impact of dietary inclusion of sugar beet pulp without or with enzyme supplementation on growth performance, some blood biochemical parameters, immune response, carcass characteristics and intestinal morphology of broiler chickens.
Two hundred, one-day old of Ross broiler chicks were used in this experiment. The broiler chicks were randomly allotted into 8 equal groups (25 chicks/group) and fed on the designed experimental diets for six weeks experimental period. group 1 (G1) fed the basal diet (BD) without SBP (control, corn-soyabean based diet); G2-G4 fed the BD containing different levels of SBP 3, 6 and 9 % respectively; while, G5-G8 had the same design of the previously mentioned groups (G1-G4) with enzyme supplementation.
The obtained results are summarized in the following:
• Broiler chicken received increasing levels of SBP showed significant reduction (P< 0.05) in their BW when compared with their control birds fed on SBP-free diet. Enzyme supplementation with the lowest inclusion level of SBP (3%) significantly improved the final BW of chickens compared with birds fed on the same diet without enzyme addition.
• Enzyme addition in broiler diet based on corn and soybean non significantly increased (P> 0.05) their WG during starter and grower periods while, significantly reduced (P< 0.05) it during the finisher period compared with birds fed the same diet without enzyme supplementation.
• Dietary inclusion of SBP with different levels (3, 6 and 9 % of diet) in broiler diet generally reduced (P< 0.05) chicken WG during most of experimental periods when compared with birds fed on the SBP- free diet.
• Enzyme supplementation to the SBP containing diets improved broiler WG during the different experimental periods especially the finisher period (P< 0.05) when compared with birds fed the same diets without enzyme supplementation.
• The lower inclusion level of SBP (3 %) reported the lower amount of feed consumed while, the higher levels of SBP (6 and 9 %) increased FI when compared the control birds fed the SBP-free diet.
• Enzyme addition with the different inclusion levels of SBP in diet increased FI compared with their respective groups fed the same diets without enzyme supplementation.
• Substitution of yellow corn with increased levels of SBP in broiler diet significantly deteriorated (P< 0.05) the FCR, PER and EEU when compared with the control birds fed on SBP- free diet. These negative impacts were enhanced with enzyme addition to these diets.
• SBP inclusion in broiler diet significantly reduced (P< 0.05) RBCs count, WBCs count, Hb and PCV of broiler chickens when compared with birds fed SBP- free diet, while the opposite result was obtained when enzyme supplemented to these diets.
• Replacing yellow corn with SBP in broiler diet without or with enzyme addition had no significant effect on GPT and GOT, MDA and lysozyme activity when compared with their reference groups.
• The superoxide dismutase enzyme activity was elevated (P< 0.05) with SBP inclusion in broiler diet without or with enzyme addition.
• SBP inclusion in broiler diet without or with enzyme addition increased TG and VLDL serum concentration (P< 0.05), while had no significant effect on cholesterol, HDL and LDL serum concentrations when compared with broiler chicken fed the SBP- free diet or the same diets without enzyme addition.
• Increasing SBP inclusion level in broiler diet significantly increased (P< 0.05) basophils, eosinophils and monocytes percentage, while significantly reduced (P< 0.05) lymphocytes and heterophils percentage in broilers.
• Feeding birds on SBP- containing diet significantly reduced (P< 0.05) the PA, PI (P> 0.05), while improved these parameters when enzyme mixture was added to these diets.
• SBP incorporation with different levels (3, 6 and 9 %) resulted in non-significant decrease (P> 0.05) in dressing percent compared with birds fed on SBP-free diet.
• The higher inclusion level of SBP (9%) in broiler diet significantly increased (P< 0.05) liver, gizzard, thymus and bursa relative weight compared with birds fed on SBP-free diet.
• Enzyme addition in SBP-containing diet significantly increased (P< 0.05) the liver, gizzard and thymus relative weight, while reduced the bursa relative weight compared with birds fed the same diet without enzyme addition.
• Enzyme addition to the corn-soybean based diet significantly increased (P< 0.05) the villus height and width, crypt depth while, non-significantly affected (P> 0.05) the villi-crypt depth ratio when compared with those fed the enzyme free diet.
• Increasing the SBP inclusion level in broiler chicken diet significantly reduced (P< 0.05) the villus height and width, crypt depth while, significantly increased (P< 0.05) the villi-crypt depth ratio compared with birds fed the SBP- free diet.
• Intestinal morphology parameters of jejunum were significantly improved (P< 0.05) with enzyme addition to the SBP-containing diet when compared with broiler chickens fed the same diets without enzyme addition.