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Articles by N.L. Radwan
Total Records ( 3 ) for N.L. Radwan
  N.A. Selim , N.Z. Boulos , A.M. Abdel-Khalek , M. Shabaan and N.L. Radwan
  Two biological experiments were conducted to determine apparent Metabolizable Energy (AME) of rich unsaturated fatty acids dry-fat (Polyfat® as an example, PF) using corn or corn-soybean meal diets with different inclusion levels of PF in adult cockerel diets. The biological experiments designed to follow procedures of excreta total collection method (TCM). The chemical evaluation of PF included determination of peroxide No., acid No., fatty acid profile and gross energy. Then different mathematical equations were applied to calculate AME of PF based on the chemical evaluation. The determined values of AME of PF using chemical methods were 7160 and 7188 kcal/kg for PF. Among biological experiments, using restricted quantity of corn diet with high levels of PF (25 or 50% of diet) resulted in lower AME values (4724 and 3992kcal/kg PF). While applying ad libitium consumption of corn-soybean practical diet containing 3% soybean oil (as reference oil), 3.8% of PF or 50:50 mixture of both (1.5% SO+1.9% PF), gave more realistic value of 6973 kcal/kg for PF. Mixing PF with soybean oil showed clear synergism effect and added caloric value of 9.6% (737 kcal) to the mixture above the expected value. Applying simple regression procedures on results of chemical and biological evaluations showed highly significant (p<0.001) relationships between AME of PF and either digestible fat, dietary saturated fatty acids (%) or supplemental stearic acid (%) in diet. These relationships have been presented as high confidant prediction equations with r2 values ranged between 0.9355 and 0.9997.
  N.A. Selim , N.L. Radwan , S.F. Youssef , T.A. Salah Eldin and S. Abo Elwafa
  This study was conducted to evaluate the efficiency of different selenium (Se) sources and levels in corn-soybean meal broiler diets. For that, 400 day-old unsexed Arbor Acres broiler chicks were allocated to 10 experimental treatments in a 5 (sources) x 2 (levels) factorial arrangement. Five Se sources were tested; (1) sodium selenite (NaSe) as inorganic form; (2) selenomethionine (Se-Yeast) as organic form; (3) Zinc-L-selenomethionine (Zn-Se-Meth) as more recent organic form; (4) powder form of Nano Se form (P-Nano Se) and (5) Liquid form of Nano Se (L-Nano Se). Also two inclusion of Se levels in diets; 0.15 and 0.30 ppm, were examined. The inorganic and organic forms of examined Se were obtained from commercial suppliers while both powder and liquid forms of Nano Se were prepared immediately before starting feeding phases of the experiment. The prepared 80 nm Se nano-particles were synthesized by chemical reduction method and characterized by Transmission Electron Microscope, X-ray diffraction and spectrophotometry. Three phases (1-10, 11-24 and 25-40 d) of feeding were applied and all birds were kept under similar management conditions. Parameters of growth performance, carcass characteristics and concentration of Se in both liver and thigh muscles were investigated. Also assay of Malnodialdhyde (MDA) was carried out in frozen (6 months at -20°C) thigh muscles to investigate the oxidation status of broiler meat. The obtained results showed significant improvement of growth performance and Se concentration in liver and thigh tissues either due to using organic or nano forms of Se, or by increasing the inclusion Se level from 0.15 to 0.30 ppm in broiler diets. While carcass abdominal fat%, giblets% and MDA content in thigh muscles did not affected due to Se sources or levels. Liver showed grater Se concentration than thigh muscles. The overall experimental results showed that using Se-Yeast or Zn-Se-Meth as organic forms of Se, or L-Nano Se as nano form of Se at level of 0.30 ppm in broiler diets or its equivalent in drinking water, respectively, is more effective to get better growth performance and quality of broiler meat. But further studies about the safety of using nano form of selenium as feed additives are needed.
  N.A. Selim , N.L. Radwan , S.F. Youssef , T.A. Salah Eldin and S. Abo Elwafa
  This study was conducted to evaluate both physiological and immunological efficiency and toxicological effects of different selenium (Se) sources and levels in corn-soybean meal broiler diets. For that, 400 day-old unsexed Arbor Acres broiler chicks were allocated to 10 experimental treatments in a 5 sources x 2 levels factorial design. Five Se sources were tested; (1) sodium selenite (NaSe) as inorganic form; (2) selenomethionine (Se-Yeast) as organic form; (3) Zinc-L-selenomethionine (Zn-Se-Meth) as more recent organic form; (4) powder form of Nano Se form (P-Nano Se) and (5) Liquid form of Nano Se (L-Nano Se). Also two inclusion of Se levels in diets; 0.15 and 0.30 ppm, were examined. The inorganic and organic forms of Se were obtained from commercial suppliers while both powder and liquid forms of Nano Se were prepared immediately before starting feeding phases of the experiment. The prepared 80 nm Se nano-particles were synthesized by chemical reduction method and characterized by Transmission Electron Microscope, X-ray diffraction and spectrophotometry. Three phases (1-10, 11-24 and 25-40 d) of feeding were applied and all birds were kept under similar management conditions. Parameters of blood picture, immunity status, antioxidant status, some plasma constituents and T3 hormone were investigated. Also histological examination of liver samples was carried out at 40 days of age. The obtained results showed significant improvement of some hematological parameters, cellular immunity and antioxidant status either due to using organic or nano forms of Se, or by increasing the inclusion Se level from 0.15 to 0.30 ppm in broiler diets. While humeral immunity against Newcastle Disease Virus and Avian flow Virus (H5N1), plasma proteins, activity of liver enzymes and malnodialdhyde (MDA) content in plasma did not affected due to Se sources or levels. Concentration of T3 hormone significantly increased by increasing Se level from 0.15 to 0.30 ppm in the diet. The histological examination of liver showed some severe pathological changes due to increasing Se level from 0.15 to 0.30 ppm for most sources while using 0.15 ppm of Se from inorganic or organic forms of Se showed normal histological structure of liver tissues. The overall experimental results showed although using Zn-Se-Meth as organic form of Se or L-Nano Se as nano form of Se or increasing the supplemental Se to 0.30 ppm in broiler diets or its equivalent in drinking water is more effective to get better, physiological, immunological and antioxidant status of broiler chicks. Inclusion Se-Yeast as organic form of Se in broiler diets at level 0.15 ppm was more save to liver tissues and kidney function. Further studies about the safety of using nano form of selenium as feed additives are needed.
 
 
 
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