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Articles by M.R. El-Gogary
Total Records ( 3 ) for M.R. El-Gogary
  F.S.A. Ismail , M.R. El-Gogary and M.I. El-Nadi
  The present study was carried out to investigate the effects of dietary supplementation with vitamin E and stocking density on performance, thyroid function, plasma concentration of corticosterone (Cort), some blood parameters, (antibody (Ab) titers against Newcastle Disease Virus (NDV) and Avian Flu virus (AF)) and antioxidant status in broiler chickens. In all 192; 3-day-old commercial broiler chickens (cobb 500) were randomly divided into 8 treatments groups, each of which include 4 replicates. Experimental treatments consisted of a 4x2 factorial arrangement design with 4 levels of vitamin E and 2 levels of stocking density (11.90 birds m-2 as the normal stocking density or 16.66 birds m-2 as the high stocking density). Vitamin E levels were 0.0, 200, 300 and 400 mg kg-1 diet. Increasing vitamin E level in the diet did not affect Live Body Weight (LBW), Body Weight Gain (BWG), feed intake and FCR. Also, increasing vitamin E levels had no effects on T4, Total Lipids (TL), total cholesterol (Chol) and high density lipoprotein cholesterol (HDL). However, supplementing vitamin E had a significant effect on SOD, NDV and AF titers but decreasing effect on MDA. In addition, plasma Cort and LDL levels were lower at 300 mg kg-1 vitamin E supplementation but plasma Total Protein (TP) and albumin (Alb) levels were higher at 300 mg kg-1 vitamin E supplementation. The normal stocking density has significant effects on LBW, BWG, FI, Cort, TP, TL and chol compared with the high stocking density. However, stocking density did not affect FCR, T3, T4, Alb, LDL, HDL and SOD. The results of the present study show that supplementing of vitamin E at 300 mg kg-1 of diet has a positive effect on productivity, immunity and blood parameters in broiler chickens.
  M.M.M. Azzam and M.R. El-Gogary
  A total of 240 Cobb 500 broiler chicks, 18 days old, were allocated to 10 treatments groups, each of which included 4 replicates. Experimental treatments consisted of a 5×2 factorial arrangement with 5 levels of L-threonine (Thr) supplementation and 2 levels of stocking density (11.90 birds m-2 as the normal stocking density or 16.66 birds m-2 as the high stocking density). L-Thr was added to a basal diet at 0.0 (control group), 0.25, 0.50, 0.75 and 1.00 g kg-1 diet. Dietary Thr values were 0.69, 0.71 (deficient), 0.74 (adequate; 100% NRC), 0.76 and 0. 79% (excess) of the current NRC recommendations. At 42 days of age, dietary Thr levels had no significant effect on performance, immunity, plasma total protein and glucose (GLU). However, plasma cholesterol (CHO) levels decreased significantly (p<0.05) with L-Thr supplementation and the lowest value occurred at 0.74% total dietary Thr. In addition, plasma triiodothyronine (T3) and thyroxine (T4) levels were higher (p<0.05) at 0.76% total dietary Thr compared with the control group. The normal stocking density resulted in better performance (p<0.05) compared with the high stocking density. However, stocking density did not affect plasma total protein, total Ig, IgG, IgM, total lipids, GLU, CHO, T3 and T4 levels. Interactions between Thr level and stocking density were observed for plasma levels of total lipids and cholesterol. In conclusion, total dietary Thr level at 0.69% (93% of NRC recommendations) is sufficient to improve broiler performance or immunity under high stocking density. However, 0.74% total dietary Thr level has a positive effect on decreasing plasma total lipids and cholesterol levels during growing-finishing phase.
  M.R. EL-Gogary , F.S.A. Ismail , Kh.El. Sherif and S.A. Tuama
  Objective: The objective of this study was to examine the effects of Nutrient Density (ND) and physical form. Materials and Methods: A 5x2 factorial arrangement was used with five dietary nutritional densities and two physical forms (mash and pellets) on production characteristics, hormone function, antioxidant enzyme and fatty acids profile of broilers. Dietary treatments were formulated to contain recommendation of broiler chicks (control), two high levels (H1 and H2) and two low levels (L1 and L2) from ME, crude protein and amino acid (methionine and lysine) densities that were fed from 1-49 days of age. Results: Feeding the low nutritional density diets (L1 and L2) produced significantly better means of LBW, BWG, FI and FCR as compared to other groups. The FI and FCR for birds fed on mash were superior and significant for others fed pellet diets. Low nutritional density was highest concentration of T4, T3 and IGF-1 levels. In addition, there was no significant effect on MDH. However, nutritional density significantly increase SOD and catalase with low levels and high levels of nutritional density compared to the control group. Fatty acids profile of blood plasma in broiler chicks showed inconsistent trend especially when both total unsaturated fatty acids to saturated fatty acids and omega-6 to omega-3 ratios are considered. This difference is a reflection of the higher levels of both dietary levels of crude protein, added vegetable oils, lysine and methionine levels in the diets. Conclusion: The present results indicate that it is possible to reduce low nutritional density without any detrimental impact on growth performance.
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