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Articles by A.E. El-Sherbiny
Total Records ( 4 ) for A.E. El-Sherbiny
  H.M.A. Hassan , A. Samy , A.E. El-Sherbiny , M.A. Mohamed and M.O. Abd-Elsamee
  Background: The environmental issues related to the presence of phosphorus (P) in poultry excreta have led the researchers to manipulate the diet of poultry in order to decrease the P excretion without having any negative impact on the performance of birds. Presently, added minerals are used as nanoparticles in order to increase absorption and subsequent decreased presence in poultry excreta. Therefore, an experiment was conducted to study the effect of dietary nano-dicalcium phosphate (NDCP) compared to conventional dicalcium phosphate (CDCP) on performance and excreted calcium (Ca) and P in broiler chicken. Materials and Methods: Two hundred and eighty one day-old male broiler chicks were divided into seven treatment groups for a period of 26 days. Seven experimental diets were formulated having three levels of either CDCP or NDCP at 1.75, 1.31 and 0.88% and a lower level of NDCP at 0.44%. Thus, these diets contained 100, 75, 50 and 25% of the recommended non-phytate P i.e., 0.45%. The diet having 1.75% CDCP (100% recommended non-phytate P) served as a control diet. Every dietary treatment had 4 replicates of 10 chicks each. Broiler performance, Ca and P excretion were studied. Results: Birds fed different levels of NDCP gained significant more body weight (p<0.05) and utilized feed more efficiently than the control group (1.75% CDCP). Decreasing levels of CDCP led to decrease in body weight gain and impaired feed conversion ratio compared to the control group. Values of body weight gain and feed intake increased by about 25 and 10%, respectively, feed conversion ratio improved by about 12% for birds fed NDCP compared to those fed CDCP. Level of dietary DCP significantly (p<0.001) affected Ca and P excretion while source of DCP significantly (p<0.001) affected P excretion but had no effect on (p>0.05) Ca excretion. Feeding 0.44% NDCP in the diet decreased the excreted Ca and P by 50.74 and 46.24%, respectively, compared to the control. Conclusion: It could be concluded that using NDCP in broiler diets allow successfully to reduce the dietary DCP by 75%. Diet formulated containing only 25% of the required non phytate P in form of NDCP could be used instead of 100% CDCP. Also, using dicalcium phosphate in nanoparticle size allow to reduce the excreted Ca and P by about 50% which reduce the impact of poultry on environmental pollution.
  M.A. Mohamed , H.M.A. Hassan , A. Samy , M.O. Abd-Elsamee and A.E. El-Sherbiny
  Background: A broiler experiment was carried to study the effect of using nano dicalcium phosphate (NDCP) compared with the conventional dicalcium phosphate (CDCP) on carcass characteristics and bone measurements. Materials and Methods: Seven groups of one day-old (Ross 308) male broilers were fed on seven experimental diets. Diets were formulated to contain three levels of CDCP or NDCP being, 1.75, 1.31 and 0.88% and a less level of NDCP being 0.44%. These levels supplied 100, 75, 50 or 25% of the recommended dietary available P requirement, correspondingly. Diet of 1.75% CDCP served as a control. The Ca: P ratio was kept 2:1 in all the diets. At the 26th day of age, carcass characteristics and tibia bone parameters were measurements. Results: No significant differences were detected on liver, heart and gizzard weights (% of live body weight) among all treatments while carcass weight represents live body weight. Using NDCP instead of CDCP showed significant (p<0.001) increase in the measured bone parameters. Birds fed 0.44% dietary NDCP showed comparable values of tibia weight, length, width and breaking strength as those fed 1.75% CDCP. The NDCP increased tibia ash, Ca and P% by 4.61, 3.62 and 4.28%, respectively, compared to CDCP. The results of bone mineral density reflected the values obtained for tibia ash, Ca and P%. Conclusion: It could be concluded that using NDCP instead of CDCP improved all the measured bone parameters. Diets formulated containing only 25% of the required available P level in form of NDCP could be used instead of using 100% of the requirements in form of CDCP. The dietary dicalcium phosphat level could be successfully decreased from 1.75-0.44% when used in form of nano particle size. Dicalcium phosphate in nanoparticle size was of about 400% as available as the conventional dicalcium phosphate.
  M.O. Abd-Elsamee , A.E. El-Sherbiny , H.M.A. Hassan , A. Samy and M.A. Mohamed
  A broiler growth experiment was conducted using 360 one-day old Ross 308 chicks to study the effect of reducing dietary phosphorus and adding phytase enzyme. Two diets were formulated in starting period (1-20 days): a control diet contained 0.50% Available Phosphorus (AP) and a low P diet contained 0.40% AP. Such low P diet was fed without or with phytase supplementation (500 IU kg-1). At the growing period (21-35 days) every group of birds of the first period was divided into two sub-groups. Two grower diets were formulated, a control diet contained 0.40% AP and a low P diet contained 0.30% AP. The low AP diet was offered with phytase supplementation (500 IU kg-1). Growth performance, bone parameters and P excretion were measured at 20 and 35 day of age. No significant differences on chick performance among dietary treatments during the starting and growing periods were observed. The best FCR value was recorded for birds fed 0.50% AP diet in the first period then grown on 0.30% AP diet+phytase. Reducing dietary AP content did significantly (p<0.05) affect bone parameters at 20 and 35 day of age. Addition of phytase did alleviate such effect. Tibia Ca and P content significantly (p<0.001) increased by phytase supplementation. Phosphorus excretion decreased more than 20% at staring period and more than 30% at growing period when broilers were fed low P diets supplemented with phytase. The results showed pronounced beneficial effect regarding the excreted P. Supplementing phytase enzyme to broiler diets renders the dietary phosphorus contents more available to the birds. Therefore, the amount of supplemental phosphorus could be remarkably reduced. It could be concluded that reducing dietary P level and using phytase enzyme could limit quantity of excreted P from broilers without adverse effect on performance. This reduces such impact in environmental pollution.
  A.E. El-Sherbiny , H.M.A. Hassan , M.O. Abd-Elsamee , A. Samy and M.A. Mohamed
  An experiment was conducted using 300 growing Ross 308 broilers from 23 to 40 days of age. Six dietary treatments were formulated. A basal diet contained 1.48% Dicalcium Phosphate (DCP) was used as a control diet (diet 1). Diets 2 and 3 contained 50% and 25% of the DCP of diet 1 (0.74 and 0.37%, respectively), while diet 4 was formulated without DCP. Diets 3 and 4 were fed without or with supplemented phytase enzyme (500 U/kg). Every dietary treatment was fed to 5 replicates (10 chicks each). The results showed no significant differences between birds fed diets containing 1.48 % DCP or 0.74% DCP on BWG, FI and FCR. Reducing dietary DCP level to 0.37% slightly decreased BWG compared with birds fed 0.74% DCP with inferior value of FCR. When DCP was removed from the diet BWG significantly (p<0.01) decreased and FCR recorded worth value. Addition of 500 U phytase/kg to diet 3 of 0.37% DCP significantly enhanced BWG (p<0.01), feed intake and FCR (p<0.05). Addition of phytase to the diet of no DCP did improve neither BWG nor FCR. Decreasing dietary DCP did not significantly affect length, weights and width of tibia either with or without phytase supplementation. However, birds fed the highest level of dietary DCP showed the highest values of tibia weight and length among the different groups. Tibia breaking strength (kgf) significantly (p<0.001) decreased as dietary DCP level decreased. Addition of phytase significantly (p<0.001) improved tibia breaking strength and tibia ash %. Addition of phytase to diet of low DCP did increase tibia Ca and P to reach values comparable with those of the control diet. Decreasing dietary DCP showed significant (p<0.001) decrease in the excreted Ca and P. Addition of phytase to diets of low or no DCP also decreased (p<0.001) the excreted Ca and P. This means that phytase increased the utilization of dietary Ca and P. The excreted Ca and P decreased by 41.22% and 55.26%, respectively, when birds were fed diet of no DCP compared to those fed the control diet. Also, addition of phytase enzyme to diets of low or no DCP decreased the excreted percentage of Ca and P. It could be concluded that reducing dietary P level and using phytase enzyme could be used to limit quantity of P excreted from broilers. This reduce such impact in environmental pollution.
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