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Articles by A.M. Abdel-Khalek
Total Records ( 3 ) for A.M. Abdel-Khalek
  Selim Nessrin , A.M. Abdel-Khalek and Sawsan M. Gad
  The objective of this study was to investigate response of growing rabbits to added levels of zinc, magnesium or iron. Three growth experiments were carried out using 150 NZW rabbits of 5 weeks old to study the effect of different supplemental levels of zinc, magnesium or iron on growth performance and some carcass traits. Concentrations of these elements in blood plasma, urine and/or hair or bone were measured. In each experiment, 50 rabbits were allocated individually up to the 13th week of age to one of five experimental groups. In the 1st experiment five levels of zinc (as zinc oxide) being 0, 50, 100, 200 or 400 Zn mg kg-1 diet were examined. In the 2nd experiment Mg (as magnesium oxide) was used by levels of 0, 400, 600, 800 or 1000 Mg mg kg-1 diet. Iron (as ferrous sulphate) was used in to provide levels of 0, 25, 50, 75 or 100 Fe mg kg-1 diet in the 3rd experiment. The results showed that supplementing Zn by levels of 100 or 200 mg kg-1 diet significantly (p<0.05) improved live weight gain and feed conversion ratio compared to the higher level of 400 mg kg-1 diet. Dietary Zn level had no significant effect upon feed intake, carcass traits or Zn concentration in plasma, hair or urine. Supplementing 400 up to 1000 Mg mg kg-1 diet significantly (p<0.05) improved feed conversion ratio of the diet and enhanced (p>0.05) live weight gain of the rabbits. It did significantly (p<0.05) affect feed intake and liver weight (% of body weight). Mg supplementation showed no significant effect on kidney weight and concentrations of Mg in plasma, bone or urine. Supplementing Fe had no further effect on rabbit studied criteria, except for the plasma total iron binding capacity that significantly decreased with supplementing 75 Fe mg kg-1 diet compared with the other treatments. It could be conclude that growing rabbit is tolerable to excessive dietary doses of the Zn, Mg or Fe. Also, it is quite clear that the growing rabbit responded positively to 100 mg supplemental Zn kg-1 diet, in terms of significant improvement in live body weight gain and feed conversion ratio. Also, a supplemental Mg in the rate of 400 mg kg-1 diet tended to improve live body weight gain and significantly improved feed conversion ratio of the rabbit. While, supplementing Fe above the recommended level (25 mg kg-1 diet) had no added value for growing rabbits.
  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.
  S. Abou El-Wafa , S.M. Shalash , N.A. Selim , A.M. Abdel-Khalek , A.M. Radwan and A.F. Abdel-Salam
  The contribution of enzyme (xylanase) supplementation (ES) to improving performance of broiler chicks fed decreased ME diets based on corn/ rye was investigated in the current study. Three hundred-sixty-one day old Arbor Acres chicks were randomly allocated in a 2x3x2 factorial design in twelve experimental groups, three replicates per group and ten birds per replicate. Experimental diets were based on two Cereal Sources (CS); corn alone or rye contributing to 10% of the whole diets that differed on dietary ME levels [positive control according to strain recommendations, negative control 1; 50 kcal/kg ME less than recommended and negative control 2; 100 kcal/kg ME less than recommended] at supplemental xylanase doses 0 or 16,000 U/kg diet. Feeding rye to broilers had no negative effect on total Feed Conversion Ratio (FCR) which could compensate for the significant decrease in accumulative live weight gain (BWG) compared to total corn grain feeding. Data on the effect of dietary ME level reveal a significant decrease in total BWG associated with a corresponding increase in total FI and a worsening in FCR as the dietary ME decreased. Inclusion xylanase significantly improved FCR without affecting total BWG and decreasing both abdominal fat content and liver weight. Dressing percentage was not affected by main factors investigated. Interactions studied show no significant effects on growth and most noticeable significant interactions are those for the total FCR between CSxME and CSxES. Treatments have a limited effect on the absence/presence of some pathogenic bacteria. So far it can be include rye in broiler chick diets at the rate of 10% with xylanase supplementation providing that the dietary ME level be kept within the recommendations. While enzyme supplementation is recommended in case of decreasing dietary ME level.
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