الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 76 |  |  |
| | | from | 76 | | |
Abstract
This study aimed to investigate the effect of adding different levels of EE-SBM during different treatment phases of broiler chicken Ross® 308 feed formulations on the following parameters:1-Growth performance2- Economic efficiency3- Carcass characteristics4- Histomorphometrical changes of intestine5- Meat quality A total of 198 one-day-old Ross® 308 chickens were randomly distributed into three groups with different dietary treatments. They were purchased from a commercial hatchery (from Dakahlia Company). Each treatment group contained 66 birds, which were divided into three replicates. Each replicate contained 22 birds. Isocaloric and Isonitrogenous dietary treatments were as follows: G1, control (SBM 46%); G2, G1 + EE-SBM (5% starter, 10% grower, and 20% finisher); and G3, G1 + EE-SBM (10% starter, 15% grower, and 25% finisher). The body weight of the experimental broilers was recorded at beginning of the experiment as well as on weekly basis to assess the body weight change and the growth pattern due to dietary regimens. The weighing of the birds was done in the early hours of the day before feeding; using an electronic scale .Live weight gain (g/broiler chick) at weekly interval was calculated from difference in body weight attained between the two consecutive weeks.The chicks were regularly supplied with experimental morning feeds, and the daily consumption of feed was determined by the difference between the weight of the feed provided and the remaining part, and then divided by the number of birds per day in each group.At 42 days of age, 9 birds from each dietary treatment were slaughtered according to Islamic method at the end of the trial. Prior to slaughter, birds were randomly taken and fasted for12 hours with free access to water and then weighed individually (pre-slaughter weight). Birds allowed completing bleeding and weighed; for determination of dressing percentage and carcass traits. Breast muscle samples were taken for estimation of meat quality. Intestinal samples were also taken for determination of histomorphometrical changes of intestine.The results of this experiment could be summarized under the following points: 1- Growth performance The addition of dietary Extruded-Expelled SBM in broiler chicken feed formulations Resulted good rearing results without any bad effect on growth performance. Body weight and body weight gain showed a significant increase for groups supplemented with Extruded-Expelled SBM (Express SBM) and G3 revealed the highest values among three dietary groups. Regarding feed intake (FI) during 1st, 2nd week showed a significant increase for G3 than for G2 and G1.2- Economic efficiency . The results of economic efficiency measures showed that return parameters, economic and relative economic efficiency did not differ significantly among three groups. The addition of Extruded-Expelled SBM to a diet of Ross 308 broiler chicks caused non-significant decrease in feed cost (LE) for each kg body weight and feed cost for each kg body weight gain.3- Carcass traits. The presented data revealed that non-significant changes in terms of dressing percentage and relative weights of breast, liver, heart, gizzard and proventriculus, spleen, and kidney, while pancreas relative weight increased significantly for G3. The jejunal diameter presented a significant increase for G1 compared to G2, and G3. The return from the breast and thigh was non-significantly higher in G2 and G3.4- Intestinal morphology. The results showed that the dietary extruded-pressed SBM had a beneficial effect on the gut morphology resulting in significant increase on villi length, crypt depth, and no of goblet cells, and the highest values were recorded for G3 than for G2 and G1.5- Meat quality . Results revealed that Extruded-Expelled SBM could be added to broiler diet without any bad effect on the chemical composition, free fatty acids profile, or color of meat.