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Articles by H.M. El-Sayed
Total Records ( 8 ) for H.M. El-Sayed
  H.M. El-Sayed
  Chemical co-precipitation method was used for the preparation of Co-ferrite nano particles. The particle size was about 18 nm. A magnetic anisotropy of Co-ferrite could be increased by applying an external magnetic field during the pressing of the nano particles before the final sintering. This anisotropy enhanced the squareness and the coercivity of investigated samples.
  A.A. Sattar , H.M. El-Sayed , W.R. Agami and A.A. Ghani
  The effect of Zr-substitution on the physical and magnetic properties of Li0.3+0.5xZn0.4ZrxFe2.3-1.5xO4 ferrites (x=0.0, 0.01, 0.02, 0.03 and 0.05), prepared by the standard ceramic method, has been studied. It is found that the saturation magnetization increases up to x=0.02 and then it decreases. On the other hand, the initial permeability increased while the Curie temperature remained almost constant with increasing x. The behavior of coercivity and remanence ratio was discussed. The composition dependence of the dc electrical resistivity is found to support the hopping conduction mechanism.
  N.E. El-Bordeny , A.A. Abedo , H.M. El-Sayed , E.N. Daoud , H.S. Soliman and A.E.M. Mahmoud
  This study aimed to evaluate effect of using exogenous fibrolytic enzymes on productive performance of dairy cows and milk curve response at different lactation stages. One hundred and sixteen multiparous cows were randomly assigned into two groups; fifty eight cows in each. Each group was contained 12 cows in early lactation 40±6 Days In Milk (DIM), 18 cows in mid lactation (122±4 DIM) and 29 cows in late lactation (216±2 DIM). The animals were fed total mixed ration with or without 15 g fibrolytic enzymes head–1 day–1 for five weeks. Adding fibrolytic enzymes to dairy cows ration caused a significant increase in serum total protein and glucose concentration compared to control group, while Albumin, globulin, ALT, AST, alkaline phosphates activity and total bilirubin and urea concentration were not affected. Insignificant differences were observed in feed intake as dry matter, total digestible nutrient, crude protein and net energy lactation between the two groups. Enzymes supplementation to dairy cows rations increased milk yield, 4% FCM and ECM as well as milk fat contents compared to control group, while insignificant increased protein, lactose, total solid and solid not fat contents. Feed conversions as well as nitrogen efficiency utilization were significantly improved for treated group compared to control. Fibrolytic enzyme supplementation to dairy cows ration slightly increased positive slope (b-value) at early lactation compared to control group and no significant difference at mid lactation was observed. While, significant decrease in negative b-value was noticed for cows fed ration supplemented with fibrolytic enzymes compared to control group. It could be concluded that fibrolytic enzymes supplementation to dairy cows ration at early, mid and lactation has the potential to improve its productive performance as well as it is affect milk curve response.
  H.A. Murad , A.M. Abd El Tawab , A.M. Kholif , S.A. Abo El-Nor , O.H. Matloup , M.M. Khorshed and H.M. El-Sayed
  Tannase production by Aspergillus niger was evaluated under solid-state fermentation and submerged fermentation cultures. The optimum conditions for maximum enzyme production including deferent inoculum ratios, incubation periods, initial pH values, nitrogen and carbon sources were investigated. A. niger was grown as stand cultures in 250 mL conical flasks containing tannic acid powder medium. The maximum production of tannase by A. niger was achieved at inoculum ratio of 2% (v/v), 96 h of incubation period, initial pH 5.0, yeast extract as a nitrogen sources at a concentration of 0.33 g N L-1 and palm kernel powder (PKP) as a carbon source at a concentration of 25% (w/v). PKP was found to be the best carbon source supporting production of 931.27 U L-1 min-1 compared with 6.25 U L-1 min-1 for wheat straw.
  H.M.M. Khattab , H.M. El-Sayed , S.A.H. Abo El-Nor , H.A. EL-Alamy and R.M.A. Abd El-Gawad
  Twenty lactating buffaloes divided into 4 groups (five each) were used to evaluate the singular and combined effect of bovine somatotropin and monensin on the productive performance of Egyptian dairy buffaloes. Treatments were (1) control, (2) injection of exogenous bovine somatotropin (bST), (3) concentrate feed mixture top dressed with 400 mg of monensin (M)/d/animal, (4) somatotropin (bST) and monensin in combination, during 14 day before expected calving and the first 120 day of lactation period. Diets and managements were the same for all animals during the experimental period. Dry matter intake was increased for animals which treated with rbST. Digestibility co-efficient of DM, OM, CF, EE and NFE were not affected by treatments, however, digestibility of CP was significantly higher in animals treated with rbST. Milk yield and 4% fat corrected milk yield were significantly (p<0.01) higher in animals treated with rbST group than other groups. Milk fat, Total Solids (TS), Total Protein (TP) and ash contents were not significantly (p>0.05) changed by treatments, however, milk lactose content was significantly (p<0.01) increased by treatments. Plasma total protein and glucose concentrations were significantly (p<0.01) increased by rbST treatment, however, plasma albumin, globulin, A/G ratio, urea, GOT, GPT and cholesterol contents were not significantly affected by treatments. The results of the present study suggest that rbST is efficacious in increasing milk yield without effect on milk composition and without any adverse effects on lactating buffaloes.
  A.M. Abd El Tawab , O.H. Matloup , A.M. Kholif , S.A.H. Abo El-Nor , H.A. Murad , H.M. El-Sayed and M.M. Khorshed
  Two experiments were carried out to evaluate the effects of laboratory produced tannase enzyme (Tanozym) to diet including Palm Kernel Powder (PKP) on in vitro dry matter and organic matter disappearance (IVDMD and IVOMD) and in vivo nutrients digestibility, nutritive values, milk production and composition by lactating Baladi goats. In vitro experiment, IVDMD and IVOMD, were determined for control diets (60% CFM and 40% Berseem hay); (T1) control diet plus different levels of polyethylene glycol (PEG), being 10, 15 and 20 g kg-1 DM and (T2) control diet plus different levels of Tanozym (3.9, 5.85 and 7.8 U kg-1 DM). The maximum IVDMD and IVOMD values were observed with 5.85 U kg-1 DM for Tanozym and 20 g kg-1 DM for PEG compared to control, however there was no significant (p<0.05) difference between 15 and 20 g kg-1 DM. The in vivo experiment was carried out on nine lactating Baladi goats after 7 days of parturition where animals were divided into three groups, three animals each, using 3x3 Latin square design. The first group fed control diet (60% CFM and 40% Berseem hay), the second group fed T1 (control diet plus 15 g kg-1, DM), the third group fed T2 (control diet plus 5.85 U kg-1, DM). Tanozym supplementation significantly (p<0.05) increased nutrients digestibility, nutritive values, ruminal Total Volatile Fatty Acids (TVFA’s) but insignificant (p<0.05) increased ammonia nitrogen (NH3 N). Lower significant (p<0.05) values of rumen pH were recorded for treated groups compared with the control. Blood serum of animals fed Tanozym and PEG had higher values of total protein, albumin, globulin, total lipids, urea and glucose but lower values of AST and ALT compared with those of control. Daily milk yield, SNF, lactose and ash yield were significantly (p<0.05) increased with Tanozym compared control group. While, there are no significant (p>0.05) differences among groups for fat corrected milk 4%, total solids, fat and total protein yield.
  A.A. Aboamer , M.S.A. Khattab , S.A.H. Abo El-Nor , H.M. Saleh , A.M. Kholif , I.M. Khattab , M.M. Khorshed and H.M. El-Sayed
  Background: Synchronization the rate of which dry matter and crude protein degraded at the rumen significantly affects the synthesis of microbial protein and thus the efficiency of feed utilization. During previous study a new software application "Lacto-sheep" had been developed to facilitate the formulation of the least cost ration considered this important factor. So that formulation of a synchronous least cost ration is possible and not difficult. This study was carried out to investigate the advantages of feeding synchronous least cost ration as an alternative to the traditional least cost ration on nutrients digestibility and milk production and its constituents. Materials and Methods: The kinetics of dry matter and crude protein disappearance and approximate analysis were determined for each feed ingredients used. Then, using our feed formulation software "Lacto-Sheep" two diets; traditional least cost and synchronous least cost ration were formulated and fed to two groups of multiparous lactating Barki ewes (5 ewes each), suckling single with an average body weight (35.10±2.50 kg) using completely random design. Experiment started 2 weeks after lambing and lasted 60 days. Results: The synchronous least cost ration contained variety of protein sources compared with the least cost ration, which did not contain any rich source of protein (soya bean or cotton seed meal) that’s because the cost of feed is the main limiting factor regardless optimizing feed utilization. Digestion coefficient of crude protein was slightly improved in group fed synchronous least cost ration. In addition, milk production and its components were also slightly higher. However, the differences were not significant. Conclusion: Based on the results obtained from this study, synchronous least cost ration seemed to be more practically appropriate ration for feeding lactating Barki ewes.
  H.H. Azzaz , H.A. Murad , A.M. Kholif , T.A. Morsy , A.M. Mansour and H.M. El-Sayed
  Two experiments were carried out to evaluate the effects of fibrolytic enzymes supplementation on in vitro degradation of sugar beet pulp and in vivo nutrients digestibility, milk yield and its composition by mild-lactating buffaloes. In the in vitro experiment, dry matter and organic matter disappearance (IVDMD and IVOMD) were determined for sugar beet pulp supplemented separately with laboratory produced fibrolytic enzymes (Asperozym) and commercial fibrolytic enzymes source (Tomoko®) at 3 levels (0, 1, 1.5 and 2 g kg-1 DM). Increasing the Asperozym and Tomoko® supplementation levels up to 2 g kg-1 DM exhibited the highest (p<0.05) values of IVDMD and IVOMD. In the in vivo experiment, fifteen mild-lactating buffaloes after 3 months of parturition were divided into three groups, five animals each, using complete random design. The first group was fed on 45% Concentrate Feed Mixture (CFM), 30% corn silage ,15% dried sugar beet pulp and 10% rice straw (control ration). The second group was fed control ration supplemented with Asperozym at 2 g kg-1 DM (R1), while the third group was fed control ration supplemented with Tomoko® at 2 g kg-1 DM. (R2). Asperozym and Tomoko® supplementation significantly (p<0.05) increased DM, OM, CF, NFE, NDF digestibility for treated groups compared with the control group, while blood plasma parameter , milk yield and its composition did not significantly (p<0.05) change among all groups.
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