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Articles by M.R. El- Gogary
Total Records ( 3 ) for M.R. El- Gogary
  M.R. El- Gogary and M.M. Azzam
  A total of 240 Cobb 500 broiler chicks, 18 day old were allocated to 10 treatments groups, each of which included 4 replicates. Experimental treatments consisted of a 5x2 factorial arrangement with 5 levels of L-tryptophan 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). Crystalline L-Trp was added to the basal diet at 0.0 (100%, NRC), 0.25 (114%, NRC), 0.50 (128%, NRC), 0.75 (141%, NRC) and 1.00 (156%, NRC) g kg-1 diet to obtain the dietary Trp level at 1.8, 2.05, 2.3, 2.55 and 2.8 g kg-1. Increasing L-Trp level in the diet did not affect LBW, BWG and FCR (p>0.05). However, feed intake decreased significantly with L-Trp and it was minimized at 0.75 and 1.0 g kg-1 diet. Also, increasing L-Trp level had no effects on immunity, plasma total protein and glucose (GLU). However, adding L-Trp at 0.75 or 1.00 g kg-1 diet increased liver weight. Also, plasma cholesterol (CHO) levels decreased significantly (p<0.05) with L-Trp supplementation and the lowest levels occurred at 0.25 L-Trp (114%, NRC). In addition, plasma triiodothyronine (T3) and thyroxine (T4) levels were higher at 0.75 (141%, NRC) L-Trp supplementation (p<0.05). 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, GLU, CHO, T3 and T4 levels. Significant interactions between Trp level and stocking density were observed for plasma levels of CHO. Findings suggest that addition of L-Trp up to 0.25 g kg-1 achieve 114% of NRC recommendations of dietary Trp that has a positive effect on decreasing plasma total CHO levels.
  M.H. Rabie , Hayam M.A. Abo El- Maaty , M.R. El- Gogary and Marwa Sh. Abdo
  This study was undertaken to evaluate the effect of different dietary levels of Canola Meal (CM) on growth performance and histological responses of broiler chicks. Cobb-500 day-old chicks were randomly distributed to five equal treatments, each of three replications. Ten starter and grower CM-diets (0.0, 10, 12.5, 15 and 20%) were formulated and used for 6 weeks. The chicks were kept in brooding and rearing batteries and fed their respective experimental diets. All chicks were managed similarly. The criteria of response were performance, carcass traits, plasma thyroid hormones and histological characteristics of liver and thyroid. Feeding CM-containing diets (up to 15%) did not adversely affect growth performance or carcass traits but relative weight of thyroid was significantly increased. Increasing dietary CM level up to 20% caused significant increases in feed intake, percentages of abdominal fat and thyroid gland but negatively affected weight gain, feed conversion ratio, bursa relative weight and plasma thyroxin concentration compared with the control chicks. Plasma level of triiodothyronine and activity of alanine aminotransferase were not affected by dietary treatments. Activity of plasma aspartate aminotransferase was significantly increased in chicks fed the highest two levels of CM compared with the control ones. The chicks fed the 20% canola meal diets exhibited progressive changes in the liver architecture and thyroid structure. Taking the histological feature of liver and thyroid, plasma thyroid hormones and growth performance into account, it could be concluded that canola meal can safely be included in broiler diets at a level of 15%.
  M.R. El- Gogary , F.S.A. Ismail and M.I. El- Nadi
  This study was undertaken to evaluate the effect of dietary supplementation with Vitamin E (VE) and stocking density on growth performance and histological responses of broiler chicks. Cobb-500 3 day old chicks were randomly distributed to eight equal groups, each of which contained four replications. An experiment with a factorial arrangement of treatments (4x2), 4 levels of VE (0.0, 200, 300 and 400 mg kg-1 diet) and 2 levels of stocking density (11.9 birds m-2 as the normal stocking density or 16.66 birds m-2 as the high stocking density). Apart from the effect of stocking density, dietary supplementation with VE did not affect Live Body Weight (LBW), Body Weight gain (BW), Feed Intake (FI), Feed Conversion Ratio (FCR), carcass traits or lymphoid organs examined. The high stocking density had a negative effect on LBW, BWG and FI but FCR and carcass traits were not affected compared with the normal stocking density, irrespective of the effect of added VE. Dietary supplementation with VE enhanced the activity of spleen, bursa and thymus to produce many lymphocytes that help improving the immunity of birds. The high stocking density, applied herein, exerted a negative effect on the histology of lymphoid organs which may cause low immune responses. The results of the present study shown that supplemental dietary VE could improve the histological responses of lymphoid organs in broiler chickens.
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