الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 151 |  |  |
| | | from | 151 | | |
Abstract
Presented by a Ph. D. student of faculty of agriculture, Ain shams university. This study was carried out at Ras sudr station, Poultry Research Unit, Nutrition poultry Department, Desert Research Center, and the chemical analysis were conducted in the Nutrition poultry Department laboratories, Desert Research Center, during the period from September to October 2016.
The present study was designed to evaluate the potential beneficial effects of addition of a mixture of acidifiers as a growth promoters to broiler diets on growth performance, hematological and some blood biochemical parameters, antimicrobial potentiality, , gut microbial and immune lymphoid organs.
A total of 405 one day old broiler chicks Ross 308 were equally divided into 9 treatment groups (n=45 , 15 in each replicate) as follow : control= (non- supplemented basal diet ) group ; Pre/Pro H (Basal diet supplemented with 100g/ton B. subtilis and 500g/ton Mannan Oligosaccharide) group; Pre/OAs H (Basal diet supplemented with 500g/ton Mannan Oligosaccharide and 2% Sodium lactate ) group ; Pro/ OAs H ( Basal diet supplemented with 100g/ton B. subtilis and 2% Sodium lactate ) ; OAs/Enz H (Basal diet supplemented with 2% Sodium lactate and 500g/ton Enzyme) ; Pre/Pro L (Basal diet supplemented with 50g/ton B. subtilis and 250g/ton Mannan Oligosaccharide) ; Pre/OAs L (Basal diet supplemented with 250g/ton Mannan Oligosaccharide and 1% Sodium lactate ) ; Pro/OAs L (Basal diet supplemented with 50g/ton B. subtilis and 1% Sodium lactate) ; OAs/Enz L (Basal diet supplemented with 1% Sodium lactate and 500g/ton Enzyme). Feed and water were offered ad.libitum during the experimental period which lasted for 35 days.
Data were collected in terms of live body weight, weight gain, feed consumption and feed conversion during the experimental period. At the end of the experiment, three birds from each group were randomly taken and weighed and were slaughtered, eviscerated to determine carcass characteristics. At 5 weeks of age, carcass percentage traits, relative weight of primary lymphoid organs and some hematological and biochemical parameters were determined. Also, samples from ileum content were collected to evaluate the microbial count .
The results obtained can be summarized as follows:
1. Live body weight and body weight gain were significantly improved in all groups during the experimental periods compared to those of the control group .
2. Feed consumption significantly affected by supplemented treatments and recorded the best FCR compared with non-supplemented chickens , where the best values were recorded for groups OAs/Enz L, Pro/OAs L and OAs/Enz H with values being 1.640, 1.678 and 1.679, respectively.
3. Carcass characteristic traits were not affected by dietary acidifiers supplementation except carcass weight which was significantly increased compared with those of the control group.
4. The bursa, thymus and spleen relative weight which was significantly increased in added either of acidifiers whereas spleen % was significantly increased by using pre/pro H and OAs/Enz H. The bursa, thymus gland as the two main lymphoid organs in birds in terms of B and T lymphocytes production which role important in immune system with birds .
5. There was a significant differences in intestine weight and intestine length due to inclusion of addition of acidifiers in diet.
6. here were no significant differences between all treatment in pad fat or abdominal fat percentage.
7. There was a significant positive effect of adding feed additive resulted to reduce in serum cholesterol, triglycerides and LDL levels while HDL levels concentration was significantly increased.
8. Serum total lipid was not significantly affected with different treated , meanwhile, glucose was increased significantly.
9. Serum uric acid, creatinine and urea-N were not significantly influenced, also albumin, globulin and A/G ratio were not significantly influenced.
10. RBCs count, PCV%, Hb concentration, MCV, MCH, MCHC were increased significantly affected by different treatments.
11. The reduction in pathogenic bacteria count (Total coliform and E.coil ) may be due to higher sensitivity to acidity that produced by probiotic or prebiotic and organic acid salts .
12. Total lactic acid bacteria counts was significantly increased in all treatment groups, where the Pro/OAs L, OAs/Enz L and Pre/Pro H groups were the most significantly affected.
13. The most important differences occur due to probiotic, prebiotic and organic acid salts in intestinal was lowered the pH in the ileum and caeca..
In conclusion, Addition of a mixture of acidifiers (Probiotic , Prebiotic, Organic acid salts and enzymes mixture) as a growth promoters to broiler diets enhance productive performance , improve some of the biochemical and hematological indices and encourage gut useful bacteria growth ) Gut health ). Best treatments were OAs / Enz L and Pro / OAs L.