الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 163 |  |  |
| | | from | 163 | | |
Abstract
The objectives of this study were to investigate the substituting effect of SFM for SBM with or without supplemental enzyme on performance, feed utilization, carcass characteristics, blood profiles, nutrient digestibility as well as digestive enzyme activities and economic evaluation of broiler chickens. A 4×2 factorial design experiment was carried out including four levels of sunflower meal (SFM) supplement (0, 25, 50 and 75% of SFM replacing soybean meal, SBM) and two levels of supplemented avizyme (0.0 or 0.1 g/kg diet). A total number of 240 unsexed one week old broiler chicks, were randomly distributed into eight treatment groups of 30 chicks, each with three replicates each of 10 chicks. The experiment included 8 treatment groups. The results obtained showed that, live body weight was significantly (P<0.01) increased with increasing SFM up to 50% substitution for SBM in broiler diets regardless of avizyme supplementation. Body gain was statistically (P<0.01) improved with increasing SFM up to 50% as substitution for SBM in broiler chicken diets through 22 to 42 and 7 to 42 days of age Live body weight at 42 day of age and body weight gain during both periods (22 to 42 and 7 to 42 days-old) were significantly (P<0.01) improved by avizyme (0.1 g/kg) supplementation in broiler diets compared with the un-supplemented diet .Feed conversion ratios during except 22-42 and 7-42 days-old were statistically (P<0.01) improved due to SFM incorporation at levels of 25 and 50% instead of SBM in broiler diets compared to control .All values of carcass studied were not significantly (P>0.05 or 0.01) affected by feeding on the SFM meal diet and avizyme supplementation except heart and liver percentages, respectively. The plasma total protein and its fractions and triglycerides were increased with increasing SFM up to 50%, while triglyceride level was decreased with 25% of SFM. Avizyme supplementation in broiler diets significantly (P<0.01) decreased all blood parameters studied except serum globulin. Nutrient digestibilities of dry matter, crude protein, and ether extract were not significantly (P>0.05) differed due to dietary SFM level. Contrarily, digestibilities of organic matter, crude fiber and nitrogen free extract were increased with increasing SFM in broiler diets from 25 to 50 to 75% as substitution for SBM (P<0.05 or P<0.01). Net revenue and economic efficiency were improved with avizyme supplementation throughout the experiment. The best values of net revenue and economic efficiency were obtained by chicks fed diet containing 50% SFM without avizyme supplementation. It could be concluded that the incorporation of SFM as a substitute for SBM in broiler diets, improve growth performance without any undesirable effects on the liver and other related blood parameters, regulate the digestive enzymes activities as well as improve the net revenue and economic efficiency. Generally, it could be recommended that SFM up to 50% with avizyme supplementation can be used in broiler diets from 7-42 days of age, without any detrimental effects on growth performance of broiler chickens.