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Articles by R.A. Hassan
Total Records ( 4 ) for R.A. Hassan
  M.H. Rabie , F.S.A. Ismail , R.A. Hassan and Ebtehal A.H. Abo Ahmed
  The present study was conducted to determine the effects of single and combined addition of Citric Acid (CA) and Microbial Phytase (MP) on performance, egg quality and mineral utilization of hens fed graded levels of nonphytate phosphorus (NPP). The NPP levels were 0.40, 0.30 and 0.20% without and with MP (0.05%), CA (2.0%) or both. Twelve groups of both 28 weeks old hens and cockerels were fed their respective experimental diets. Criteria evaluated were feed intake, egg production, egg weight, egg mass, feed conversion ratio, egg components, shell thickness, Haugh units, yolk index, tibia ash, tibia Ca, P, Mg, Cu and Zn and apparent retention of these minerals. Feeding the 0.2% NPP diet adversely affected (p<0.01) egg production, egg weight, feed intake, egg mass, feed conversion, percent eggshell, yolk index, shell thickness, tibia ash content and retention of Cu and Zn compared with their positive control. Although birds fed 0.3% NPP gave comparable performance and egg quality to their positive controls, tibia bone ash, tibia contents of Ca and P and retention of P, Cu and Zn of the former were significantly lower than the latter. The poor productive performance and egg quality due to feeding 0.2% NPP diet were completely corrected by MP but CA was not effective. Added MP can effectively prevent the reductions in performance and egg quality and either microbial phytase or citric acid may partially alleviate the depression of mineral utilization in birds fed the low NPP diets, without a synergistic positive effect for their combination.
  Radwan Nadia, L., , R.A. Hassan , E.M. Qota and H.M. Fayek
  The main target of this study was to determine the effect of dietary natural antioxidants: Thyme, rosemary, oregano and curcuma longa on production and reproduction performance of laying local hens and study the oxidative stability of yolk shell egg storage at room temperature (16°C±2). A total number of 360 hens and 36 cocks from El-Salaam strain of 28 weeks old were divided into 12 groups with 3 replicate each (10 hens +1 cock). Birds were fed on the experimental diets, using two levels (0.5 and 1.0%) from four types of herbs (oregano, thyme, rosemary, curcuma longa) as natural antioxidants, in comparison to two levels of vitamin E (100 and 200) mg/Kg diet, in addition to two diets, one using vitamins and minerals premix with vitamin E (control) and the other without vitamin E (Negative-control).The main results obtained from this study can be summarized as follows: Addition of herbs as natural antioxidants during the laying period can improve the production performance especially at 1.0% thyme, rosemary, oregano or 0.5% curcuma longa increased egg production, egg mass and improved feed conversion. Addition of 1.0% curcuma longa increased numerically values of shell weight and egg shape index. This treatment increased percentage of yolk weight and improved yolk colour by 10.87% and 15.52%, respectively compared to control group. Addition 1.0% oregano gave the highest values of all nutrient digestibility coefficients; except ether extract digestibility that was the lowest value compared to control diet, however it was statistically insignificant. Statistically, the highest values (P<0.05) of antibody titter against sheep red blood cells were recorded for hens fed 1.0% thyme or rosemary. Thyme or rosemary at 1.0% significantly decreased plasma total lipid, in comparison to the control by 17.15 and 27.15%, respectively while total cholesterol and LDL- cholesterol decreased insignificantly. Addition of thyme, rosemary or curcuma longa at 1.0% significantly decreased yolk total lipid, in comparison to the control group by 12.14, 13.19 and 13.95%, respectively. Addition of 1% oregano or rosemary or 0.5 and 1.0% curcuma longa during laying period significantly decreased malonaldehyede formation in egg yolk and had positive effect on oxidative stability of shell eggs storage at room temperature(16°C±2). Addition of 1.0% oregano, rosemary or 0.5% curcuma longa significantly increased the percentages of fertility. While 1.0% thyme or 0.5-1.0% curcuma longa significantly increased the percentages of hatchability of fresh eggs. It could be concluded from this study that herbs could be used as natural antioxidants during laying period. Oregano, rosemary or thyme at 1.0% or curcuma longa at 0.5% can improve productive performance, fertility and hatchability and had positive effect on oxidative stability of shell eggs during storage.
  M.N. Ali , E.M.A. Qota and R.A. Hassan
  An experiment was designed to study the effect of Curcuma longa (CL), Cuminum cyminum L(CC) alone or with sulphate ion on alleviating the heat stress effects compared to vitamin C. Three hundred and sixty, 21-day old unsexed chicks of slow growing El-Salam strain were randomly divided among 8 treatments (each of 3 replicates of 15 unsexed chicks each) and housed in floor pens. One group was kept under thermoneutral condition at 28±4oC and 55±3% Relative Humidity (RH) during 21-84 day of age and fed practical corn-soybean meal diet (control diet). The other seven groups were kept for three successive days weekly under heat stress at 38±1.4oC and 49±2% RH from 12.00 to 16.00 pm. Chicks in Heat Stress treatments (HS) were fed basal diet without additives or with 250 mg Ascorbic Acid (AA) /kg diet, 0.2% of Curcuma longa (CL),0.2% Cuminum cyminum L (CC), 0.5% anhydrous Sodium Sulphate (SS), 0.2% CL+0.5%SS and 0.2%CC+0.5%SS. Heat Stress decreased body weight gain, feed intake, feed conversion, carcass percentage, nitrogen retention, ash retention and plasma antioxidants capacity while increased respiration rate (RR) and rectal temperature (RT). The addition of CL, CC alone or with SS in the diet can recover the negative effect of HS on performance, nitrogen retention, ash retention and plasma antioxidants capacity. To some extent these additives recover the negative effect on RR and RT. The Cuminum cyminum L plus sulphate seemed to be the best additive under the condition of this study.
  S.M.M. Shalash , S. Abou El-Wafa , R.A. Hassan , Nehad A. Ramadan , Manal S. Mohamed and Hoda E. El-Gabry
  This experiment was conducted to evaluate the effect of different dietary levels (0, 5, 10, 15 or 20%) of Distillers Dried Grains with Solubles (DDGS). Each level was fed without or with two enzyme supplementation, (Kemzyme plus dry® supplemented at 250 gm/ton feed or Polytec Binder plus® supplemented at 500 gm/ton feed). A total number of 450 Inshas hens (30 wks old) and 45 cocks were distributed into 15 treatments of 30 hens, each in three replicates (10 hens and one cock, each). Diets were formulated to contain 16% CP and 2700 Kcal ME/Kg at laying period. Results show that no significant differences in digestibility coefficient values of Crude Protein (CP), Ether Extract (EE), Crude Fiber (CF), Nitrogen Free Extract (NFE), Body Weight Gain (BWG), feed intake and egg quality were observed by inclusion DDGS in laying hen diets. Also, results indicated that no significant effect on semen quality, fertility, hatchability and body weight of chicks in hatch by inclusion DDGS, enzyme supplementation or interaction between DDGS levels and enzyme supplementation in laying hen diets. Inclusion of 5% DDGS in laying diets significantly increased egg production %, egg number and egg mass, compared with the other levels. However, increasing DDGS to 15 or 20% in laying hen diets significantly increased yolk color and shell thickness and significantly decreased egg production %, egg number, egg weight and egg mass and gave the worst feed conversion compared with the other levels (0, 5 and 10%). Supplementation of Kemzyme plus dry® (enzyme 1) to diets containing DDGS had significantly higher percentage of digestibility coefficient value of ether extract and increased egg production %, egg number and egg mass than those fed the other treatments. In conclusion, the present results show that DDGS can be successfully fed at levels up to 10% in laying hen diet without adverse effect on laying performance. Also, enzyme supplementation could improve the utilization of DDGS to levels up to 20% of the diet.
 
 
 
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